Re: Fl2100z feedback

开云体育

Yeah!

It's the first 6dB that makes all the difference.

73, Alek. VK6APK

On 14/02/2020 1:26 am, David Perry wrote:

Linear fine and running directly off the orion 2 as was suggested.? Dx pouring in.? Seriously.? Even at500 watts

?Very happy.

--
David G4YVM

Fl2100z feedback

David Perry

#37145

Linear fine and running directly off the orion 2 as was suggested.? Dx pouring in.? Seriously.? Even at500 watts

?Very happy.

--
David G4YVM

Re: fl2100Z misery...

David Perry

#37144

Fault lies in the rf hot line.? When the operate relay is switched to operate the rf line goes open circuit

fl2100Z misery...

David Perry

#37143

Oh woe is me.

I have been using the linear with my Tentec Orion quite happily, manually switching the relay not via the rig nor leaving it permanently shorted as when I found it. ?I have been running a max of 500 watts into good SWR. ?My procedure has been to run the rig through the un-energised linear (mains ON, OPERATE not on) and tune for perfect SWR as measured by the rig, the SWR bridge AND the meter on the ATU. ?Then tune up the linear as per manual. ?Then operate on air.

All has been good till this morning when I find that running the rig through the linear is fine but as soon as I energise the relay the init SWR goes very high, the rig rolls back and nothing is going anywhere. ? I'm guessing its that relay gone wrong maybe?

Anyone met this before? ? Ive got the covers off and apart from some heat and life wear on various resistors (the ones between the anodes particularly ) there's. nothing obviously amiss.

David G4YVM

Re: fl2100z / Tentec Orion 2

#37142

开云体育

Yes. That is a great solution. I have a 5kVA unit with 10V taps from -40V to +20V compared to the incoming mains. I use it on my AL-1500 and HF-2500 amps.

I run them on 230V and they are very happy there.

73, Alek. VK6APK

On 5/02/2020 11:26 am, W2XJ wrote:

Show quoted text

autotransformer is the solution.?

On Feb 4, 2020, at 9:41 PM, cturnertuning <clark@...> wrote:
?

My voltage here is 256. Same problem.

Sent from my T-Mobile 4G LTE device
------ Original message------

From: Alek Petkovic

Date: Tue, Feb 4, 2020 3:30 PM

To: [email protected];

Cc:

Subject:Re: [ham-amplifiers] fl2100z / Tentec Orion 2
The biggest single issue in this country (Australia) with the 2100 amps and a lot of others, for that matter, is the filament voltage. Due to our 240V to 250V mains, it is always high.

With the 2100 series amps, the filament voltage, at the tube sockets is typically 6.8 to 6.9 Volts.

Luckily, there is enough room under the chassis to install some series/parallel wirewound resistors, in the filament line, to bring the voltage back to the nominal 6.3V.

I have done this to at least 20 Yaesu amps over the years and in every single case, it has tamed them right down to become a good little amplifier with very few problems.

You can do all the other mods that you see floating around the net but I've never bothered. After the filament voltage has been corrected, I've never had an amp come back to me with problems.

73, Alek. VK6APK

On 5/02/2020 12:44 am, cturnertuning wrote:
I have a 2100B to use with the FT 101 station.? I take it to the cabin and use it on all bands. Typically run it at 500 out. Never had a single issue with it ever. Its possible it was worked on at some point and upgraded. I understand early 2100 and 2100B had real problems like you describe Jim.?

These amps where abused for sure as almost nobody hooked up the ALC and if you ran it with a 101 you then put 150 watts into it.? With the ALC hooked up and set, it backs the drive down to about 50 watts and has a clean output.? There is zero gain to place the amp on 240volt. The transformer does not have dual primary. It will just run the amp off one leg of the 240.

The Bias and Oscillation problems of early units is described here:

C

On 2/4/2020 4:06 AM, Jim VE7RF wrote:

I? had a brand? new? FL-2100B? back? in 1976.? ?Worked? on? all? bands...? for a while.??
Then? on? 10M,? it? flat? out? would? not? tune? properly on? 10M..into a flat? swr.?
The? xfmr? ran? very? hot.....even? when? on? standby? for an? hr.? (240? vac? ?60 hz)?
Cooling? was? very? minimal,? so added a? extra? fan? on? top,? sucking? hot? air out.
SWR? meter? was flaky.? SWR? would? increase as power? output? increased....which? is? nonsense? of? course.
I? believe? the? 2100Z? has? 160M.?
Pulse? tune? the? amp? (like? with? 60? wpm? dots.....and? use? a pep? meter)..should? get? aprx? 600 w? out.?

Local? buddy also? had? a new? 2100B.? ?I? tuned his,? and? promptly arced? the? bandswitch. His? was a parasitic? nightmare? from? day 1. Never? did? get? resolved.? ??
I? see? there? is a lot? of? mods? for? these? amps.? Beware,? it? has? taps for? 100/200? vac..for? JA? use.

Whatever? u? do,? don't? buy? either? version.? I? was glad to? get rid? of? mine.

Jim? ?VE7RF
-- 
Please let me quote you for your parts needs!
I offer a discount on Protunes with parts order!
Clark Turner
480-695-2898

Re: fl2100z / Tentec Orion 2

W2XJ

#37141

开云体育

autotransformer is the solution.?

Show quoted text

On Feb 4, 2020, at 9:41 PM, cturnertuning <clark@...> wrote:

?
My voltage here is 256. Same problem.

Sent from my T-Mobile 4G LTE device
------ Original message------
From: Alek Petkovic
Date: Tue, Feb 4, 2020 3:30 PM
To: [email protected];
Cc:
Subject:Re: [ham-amplifiers] fl2100z / Tentec Orion 2
The biggest single issue in this country (Australia) with the 2100 amps and a lot of others, for that matter, is the filament voltage. Due to our 240V to 250V mains, it is always high.

With the 2100 series amps, the filament voltage, at the tube sockets is typically 6.8 to 6.9 Volts.

Luckily, there is enough room under the chassis to install some series/parallel wirewound resistors, in the filament line, to bring the voltage back to the nominal 6.3V.

I have done this to at least 20 Yaesu amps over the years and in every single case, it has tamed them right down to become a good little amplifier with very few problems.

You can do all the other mods that you see floating around the net but I've never bothered. After the filament voltage has been corrected, I've never had an amp come back to me with problems.

73, Alek. VK6APK

On 5/02/2020 12:44 am, cturnertuning wrote:
I have a 2100B to use with the FT 101 station.? I take it to the cabin and use it on all bands. Typically run it at 500 out. Never had a single issue with it ever. Its possible it was worked on at some point and upgraded. I understand early 2100 and 2100B had real problems like you describe Jim.?

These amps where abused for sure as almost nobody hooked up the ALC and if you ran it with a 101 you then put 150 watts into it.? With the ALC hooked up and set, it backs the drive down to about 50 watts and has a clean output.? There is zero gain to place the amp on 240volt. The transformer does not have dual primary. It will just run the amp off one leg of the 240.

The Bias and Oscillation problems of early units is described here:

C

On 2/4/2020 4:06 AM, Jim VE7RF wrote:

I? had a brand? new? FL-2100B? back? in 1976.? ?Worked? on? all? bands...? for a while.??
Then? on? 10M,? it? flat? out? would? not? tune? properly on? 10M..into a flat? swr.?
The? xfmr? ran? very? hot.....even? when? on? standby? for an? hr.? (240? vac? ?60 hz)?
Cooling? was? very? minimal,? so added a? extra? fan? on? top,? sucking? hot? air out.
SWR? meter? was flaky.? SWR? would? increase as power? output? increased....which? is? nonsense? of? course.
I? believe? the? 2100Z? has? 160M.?
Pulse? tune? the? amp? (like? with? 60? wpm? dots.....and? use? a pep? meter)..should? get? aprx? 600 w? out.?

Local? buddy also? had? a new? 2100B.? ?I? tuned his,? and? promptly arced? the? bandswitch. His? was a parasitic? nightmare? from? day 1. Never? did? get? resolved.? ??
I? see? there? is a lot? of? mods? for? these? amps.? Beware,? it? has? taps for? 100/200? vac..for? JA? use.

Whatever? u? do,? don't? buy? either? version.? I? was glad to? get rid? of? mine.

Jim? ?VE7RF
-- 
Please let me quote you for your parts needs!
I offer a discount on Protunes with parts order!
Clark Turner
480-695-2898

Re: fl2100z / Tentec Orion 2

#37140

My voltage here is 256. Same problem.

Sent from my T-Mobile 4G LTE device

Show quoted text

------ Original message------

From: Alek Petkovic

Date: Tue, Feb 4, 2020 3:30 PM

To: [email protected];

Cc:

Subject:Re: [ham-amplifiers] fl2100z / Tentec Orion 2

The biggest single issue in this country (Australia) with the 2100 amps and a lot of others, for that matter, is the filament voltage. Due to our 240V to 250V mains, it is always high.

With the 2100 series amps, the filament voltage, at the tube sockets is typically 6.8 to 6.9 Volts.

Luckily, there is enough room under the chassis to install some series/parallel wirewound resistors, in the filament line, to bring the voltage back to the nominal 6.3V.

I have done this to at least 20 Yaesu amps over the years and in every single case, it has tamed them right down to become a good little amplifier with very few problems.

You can do all the other mods that you see floating around the net but I've never bothered. After the filament voltage has been corrected, I've never had an amp come back to me with problems.

73, Alek. VK6APK

On 5/02/2020 12:44 am, cturnertuning wrote:

I have a 2100B to use with the FT 101 station.? I take it to the cabin and use it on all bands. Typically run it at 500 out. Never had a single issue with it ever. Its possible it was worked on at some point and upgraded. I understand early 2100 and 2100B had real problems like you describe Jim.?

These amps where abused for sure as almost nobody hooked up the ALC and if you ran it with a 101 you then put 150 watts into it.? With the ALC hooked up and set, it backs the drive down to about 50 watts and has a clean output.? There is zero gain to place the amp on 240volt. The transformer does not have dual primary. It will just run the amp off one leg of the 240.

The Bias and Oscillation problems of early units is described here:

C

On 2/4/2020 4:06 AM, Jim VE7RF wrote:

I? had a brand? new? FL-2100B? back? in 1976.? ?Worked? on? all? bands...? for a while.??
Then? on? 10M,? it? flat? out? would? not? tune? properly on? 10M..into a flat? swr.?
The? xfmr? ran? very? hot.....even? when? on? standby? for an? hr.? (240? vac? ?60 hz)?
Cooling? was? very? minimal,? so added a? extra? fan? on? top,? sucking? hot? air out.
SWR? meter? was flaky.? SWR? would? increase as power? output? increased....which? is? nonsense? of? course.
I? believe? the? 2100Z? has? 160M.?
Pulse? tune? the? amp? (like? with? 60? wpm? dots.....and? use? a pep? meter)..should? get? aprx? 600 w? out.?

Local? buddy also? had? a new? 2100B.? ?I? tuned his,? and? promptly arced? the? bandswitch. His? was a parasitic? nightmare? from? day 1. Never? did? get? resolved.? ??
I? see? there? is a lot? of? mods? for? these? amps.? Beware,? it? has? taps for? 100/200? vac..for? JA? use.

Whatever? u? do,? don't? buy? either? version.? I? was glad to? get rid? of? mine.

Jim? ?VE7RF
-- 
Please let me quote you for your parts needs!
I offer a discount on Protunes with parts order!
Clark Turner
480-695-2898

Re: fl2100z / Tentec Orion 2

#37139

开云体育

The biggest single issue in this country (Australia) with the 2100 amps and a lot of others, for that matter, is the filament voltage. Due to our 240V to 250V mains, it is always high.

With the 2100 series amps, the filament voltage, at the tube sockets is typically 6.8 to 6.9 Volts.

Luckily, there is enough room under the chassis to install some series/parallel wirewound resistors, in the filament line, to bring the voltage back to the nominal 6.3V.

I have done this to at least 20 Yaesu amps over the years and in every single case, it has tamed them right down to become a good little amplifier with very few problems.

You can do all the other mods that you see floating around the net but I've never bothered. After the filament voltage has been corrected, I've never had an amp come back to me with problems.

73, Alek. VK6APK

On 5/02/2020 12:44 am, cturnertuning wrote:

Show quoted text

I have a 2100B to use with the FT 101 station.? I take it to the cabin and use it on all bands. Typically run it at 500 out. Never had a single issue with it ever. Its possible it was worked on at some point and upgraded. I understand early 2100 and 2100B had real problems like you describe Jim.?

These amps where abused for sure as almost nobody hooked up the ALC and if you ran it with a 101 you then put 150 watts into it.? With the ALC hooked up and set, it backs the drive down to about 50 watts and has a clean output.? There is zero gain to place the amp on 240volt. The transformer does not have dual primary. It will just run the amp off one leg of the 240.

The Bias and Oscillation problems of early units is described here:

C

On 2/4/2020 4:06 AM, Jim VE7RF wrote:

I? had a brand? new? FL-2100B? back? in 1976.? ?Worked? on? all? bands...? for a while.??
Then? on? 10M,? it? flat? out? would? not? tune? properly on? 10M..into a flat? swr.?
The? xfmr? ran? very? hot.....even? when? on? standby? for an? hr.? (240? vac? ?60 hz)?
Cooling? was? very? minimal,? so added a? extra? fan? on? top,? sucking? hot? air out.
SWR? meter? was flaky.? SWR? would? increase as power? output? increased....which? is? nonsense? of? course.
I? believe? the? 2100Z? has? 160M.?
Pulse? tune? the? amp? (like? with? 60? wpm? dots.....and? use? a pep? meter)..should? get? aprx? 600 w? out.?

Local? buddy also? had? a new? 2100B.? ?I? tuned his,? and? promptly arced? the? bandswitch. His? was a parasitic? nightmare? from? day 1. Never? did? get? resolved.? ??
I? see? there? is a lot? of? mods? for? these? amps.? Beware,? it? has? taps for? 100/200? vac..for? JA? use.

Whatever? u? do,? don't? buy? either? version.? I? was glad to? get rid? of? mine.

Jim? ?VE7RF
-- 
Please let me quote you for your parts needs!
I offer a discount on Protunes with parts order!
Clark Turner
480-695-2898

Re: fl2100z / Tentec Orion 2

#37138

Make sure the Orion cam tolerate the keyline voltage of the fl2100z. Not sure, but you may need a buffer to protect the radio.
73, N0NC
Chuck

Re: fl2100z / Tentec Orion 2

#37137

开云体育

I have a 2100B to use with the FT 101 station.? I take it to the cabin and use it on all bands. Typically run it at 500 out. Never had a single issue with it ever. Its possible it was worked on at some point and upgraded. I understand early 2100 and 2100B had real problems like you describe Jim.?

These amps where abused for sure as almost nobody hooked up the ALC and if you ran it with a 101 you then put 150 watts into it.? With the ALC hooked up and set, it backs the drive down to about 50 watts and has a clean output.? There is zero gain to place the amp on 240volt. The transformer does not have dual primary. It will just run the amp off one leg of the 240.

The Bias and Oscillation problems of early units is described here:

C

On 2/4/2020 4:06 AM, Jim VE7RF wrote:

I? had a brand? new? FL-2100B? back? in 1976.? ?Worked? on? all? bands...? for a while.??
Then? on? 10M,? it? flat? out? would? not? tune? properly on? 10M..into a flat? swr.?
The? xfmr? ran? very? hot.....even? when? on? standby? for an? hr.? (240? vac? ?60 hz)?
Cooling? was? very? minimal,? so added a? extra? fan? on? top,? sucking? hot? air out.
SWR? meter? was flaky.? SWR? would? increase as power? output? increased....which? is? nonsense? of? course.
I? believe? the? 2100Z? has? 160M.?
Pulse? tune? the? amp? (like? with? 60? wpm? dots.....and? use? a pep? meter)..should? get? aprx? 600 w? out.?

Local? buddy also? had? a new? 2100B.? ?I? tuned his,? and? promptly arced? the? bandswitch. His? was a parasitic? nightmare? from? day 1. Never? did? get? resolved.? ??
I? see? there? is a lot? of? mods? for? these? amps.? Beware,? it? has? taps for? 100/200? vac..for? JA? use.

Whatever? u? do,? don't? buy? either? version.? I? was glad to? get rid? of? mine.

Jim? ?VE7RF

-- 
Please let me quote you for your parts needs!
I offer a discount on Protunes with parts order!
Clark Turner
480-695-2898

Re: fl2100z / Tentec Orion 2

#37136

I? had a brand? new? FL-2100B? back? in 1976.? ?Worked? on? all? bands...? for a while.??
Then? on? 10M,? it? flat? out? would? not? tune? properly on? 10M..into a flat? swr.?
The? xfmr? ran? very? hot.....even? when? on? standby? for an? hr.? (240? vac? ?60 hz)?
Cooling? was? very? minimal,? so added a? extra? fan? on? top,? sucking? hot? air out.
SWR? meter? was flaky.? SWR? would? increase as power? output? increased....which? is? nonsense? of? course.
I? believe? the? 2100Z? has? 160M.?
Pulse? tune? the? amp? (like? with? 60? wpm? dots.....and? use? a pep? meter)..should? get? aprx? 600 w? out.?

Local? buddy also? had? a new? 2100B.? ?I? tuned his,? and? promptly arced? the? bandswitch. His? was a parasitic? nightmare? from? day 1. Never? did? get? resolved.? ??
I? see? there? is a lot? of? mods? for? these? amps.? Beware,? it? has? taps for? 100/200? vac..for? JA? use.

Whatever? u? do,? don't? buy? either? version.? I? was glad to? get rid? of? mine.

Jim? ?VE7RF

Re: fl2100z / Tentec Orion 2

GG LL

#37135

FL2100B (not Z, but quite similar) with FT-450, at the club

Regards
Guillermo - LU5WE.

Show quoted text

El 3/2/20 a las 17:49, David Perry escribió:
Anyone using a fl200z with anything...?

Re: fl2100z / Tentec Orion 2

David Perry

#37134

Anyone using a fl200z with anything...?

fl2100z / Tentec Orion 2

David Perry

#37133

Ive been very kindly loaned a 2100Z to try with my Orion 2.

Anything I should be aware of before I hit the "smoke on" button?

David G4YVM

Re: Question about Ameritron AL-1200 Amp (Uses one 3CX1200Z7 tube)

#37132

Cliff,? the? link? for? the? ameritron? site? does? not? work? for? the AL1200? manual? (nor? the? AL-1500,? under? downloads).??
The 2nd? link? works....? but? not sharp,? slightly? blurred.? Appears? that? the? step? start? resistor is? 'R3".... and? is a 10? ohm? @ 12? watt unit.? (lou,? can? u? verify? the? value +? wattage).
RLY-2? is? listed? as? a ..'SPDT? 120 vac? AC? relay'...? wired? as a SPST.? ?(NC? contact? not? used).? ? No? current? ratings? given.
I? see? no? delay? circuit for? RLY-2? anywhere...except? for? the brief? V? drop? across R3...which? temp? kills? the? V? into RLY-2. (imo,? that's a piss? poor? excuse? for a? 'delay? circuit').
With? only? 10? ohms? for? the? step? start? resistor,? the? filter? caps? will? charge up extremely? fast...and? RLY-2? will? activate..almost? instantaneous.?
With only 10 ohms,? caps? will? be? almost? fully? charged....? which? will? minimize? the? secondary? surge...(that's? good).....IF? there? is? enough? of a delay? before RLY-2 activates.?
A? split? second delay? is? not long? enough.? It? requires a proper 2-3? second delay? circuit.? They? could? have? used a DC? relay, with? a simple? RC? time? constant....or a programmable? timer.

Jim? VE7RF? ? ??

Re: Question about Ameritron AL-1200 Amp (Uses one 3CX1200Z7 tube)

#37131

Hi,

Not sure this helps but Ameritron has standalone stepstart units for both 120v and 240v as needed.

ICP-240 and ICP-120 and are about $89.00. Well built and are plug and play.

I have 3 here that I use.

Usual disclaimer and just satisfied customer.

73,

Phil W9IXX

Show quoted text

From: "Jim VE7RF" <jim.thom@...>
To: "ham-amplifiers" <[email protected]>
Sent: Thursday, January 30, 2020 2:31:30 AM
Subject: Re: [ham-amplifiers] Question about Ameritron AL-1200 Amp (Uses one 3CX1200Z7 tube)

Here? is? how? I? did? my? external step? start.? ?I? used? a? ?8"? x 8"? x 4"? electrical? box....with? knock? outs.
240? vac? line, using 10? gauge? wire, is hardwired? from? 2? pole? breaker? in my? 100A sub panel..to? 8x8x4? box.? 240? power? cable? from L4PS? also? hardwired? to same? 8x8x4? box.?
Garden? variety? DPST? 30A? relay,? (P+B,? deltrol,? etc)? is? installed in? 8x8x4 box...and used? to? apply? the? 240? vac. (Drake RF? deck? ON/OFF? switch? left to? ON? position).
2nd? relay,? SPST,? also? 30A,? used to? shunt? the? 25? ohm @ 100? watt? wire? wound.? Wire wound? mounted? on? standoff's.? So? 2 x relays + resistor mounted in? the? 8x8x4? box.?

Small? control? cable wired? from? 8x8x4? box? to? desk....? terminating? in a small? mini? box.? Mini? box? has? 2 x? miniature? toggle? switches on it.? ?One? toggle? per? relay? coil.

Toggle? #1? applies? 240? vac.? After 3-5 secs,? toggle? #2 is activated,? shunting the? 25? ohm resistor.? Dead simple.? ?Step? starts both the? B+? AND? the? fils....at the? same? time.?
ZERO? arcing? when? either? relay is activated.? ?It's? just a? manual? step? start? setup.? 250 Volt? MOV? across SPST? step? start? relay? contacts.? (130 Volt? MOV? across? coils? of both? relay? coils).?

If switching? from? 2650 vdc....down? to? 1900? vdc,? no? problem.? ?But? when? switching back? from? 1900? to? 2650? vdc, the? ?toggle? #2? is? 1st? activated....? putting? the? resistor? back inline.
Toggle #2? ?then activated,? again? shunting? resistor.?

240? vac /? 25 ohms? = 9.6? amps? =? ?2304 watts...when? T=0.? That only? last a? few? Msecs? as? caps? charge? up.? ?(The? harbach board? uses a 22 ohm,? 25 watt cement? resistor).

(I? have? also used a? 0-15? sec? adjustable? timer? to apply the? 120 vac? to the? coil? of the step start contactor....? but? that's? only? on? Big? ?HB? B+? supplies,? and ONLY? the? B+? supply? is? step? started. The? fil? from? the? tube? has it's? own? step? start /variac? combo...? bigger? metal? triodes).

Jim? VE7RF??

Re: Question about Ameritron AL-1200 Amp (Uses one 3CX1200Z7 tube)

#37130

I? went? through? the? SSR? scenario? ?years? ?ago.? The? issue? with? em? is.....? they EACH? require? a massive? heat? sink.? SSR's? are only? SPST? by? design, so to? apply? 240? vac,? you require? 2? of? em...+? 2? x heatsinks.? The? heatsinks? are? stupid? big.? If? only? one big? heatsink? used,? each? SSR must? be well? spaced? apart,? or? they? will? cook? each? other.? ?Ideally,? you? want a zero? voltage turn? on......? and a? zero? CURRENT? shut? off.? ?IMO,? they? also? have too? much? leakage? across? em...that's a safety? issue.

For these? table? top? amps, like? my? Drake? L4B, it? was? simpler, to just install a DPST? relay (30-40A? contacts)? plus a SPST? relay (30-40A? contacts)... +? a new? 25? ohm @? 100? watt WW (cheap? at? Mouser)? into an? 8x8x4 outboard box.? ?You? can? always? use a DPST? for? the? shunting? relay,? with? one? set? of? contacts? to? shunt? the? resistor...and? the? 2nd? set? of? contacts? has? the? key? line through? it.? That? way,? the? amp? can? not? be? keyed, until the? step? start has? completed.? ?BTW,? only? ONE? step? start? resistor? required,? regardless? of? whether? 120? vac? or? 240 vac? is? used.

On? that? HB? 6700? vdc (10? kva? xmfr)? supply I? built,? I? installed a 0-15? sec? timer? for the? step? start.? Plug in? ?8 pin? octal? type? (flush? mount? type socket).? Timer? uses? ?DPDT-10A? contacts.? One? set of? contacts? used to apply? 120? vac? to the? shunting relay's? coil.? ?The? 2nd set? of? contacts wired? to? a pair? of? RCA? connectors..which? had? the? key? line? routed? through? em.? ?Same? deal,? the? YC-156? could? not? be? keyed, until? the? 15? sec step? start sequence is completed.? ?

On? buddy's? 8 kv? supply (15 kva xmfr),? we? used? surplus (NIB-$50.00,? still? available,? they? even? came? with aux? contacts)? ?3PST-135A? contactors...(220? vac? solenoid coil..designed? to? work? from? 200-250? vac).? We paralleled (using 1x1 x 1/8",? angle? AL)...? ?all? 3? x contacts? on? both? the? input +? output of? 3 contactors.? That? turns? em? into a 400A? contactor.? One? assy? into? each? leg? of? the? 240? line.? 3rd? contactor's 1x1? angle? al? is directly? bolted? to? the? 1x1? angle? of? one? of? the? ?other? contactor's? output. 0-15? sec? timer? used? to? activate the? shunting? contactor.? ?Again,? we? 1st? looked? at? SSR's? in? depth,? and? gave? up? on em.? The? SSR? maker? depicted? a typ? use? for? SSR's....? using a myriad? of em? in both parallel? +? series....? to? turn? on +? off....? a? 150? hp? electric pump? motor.....which? ran? on 600? vac,? 3? phase.? Sounds? wonderful? till? you? saw? their? depicted schematic,? complete? with? a ton? of? SSR's? +? heatsinks....way? too much? to? go? wrong....and an? unholy bitch? to? trouble? shoot, ever? mind? the? back emf? when? shutting? off a? 150? hp..under? load !? ?(a? simple 3? pole? contactor is? what? the? SSR's? are? trying? to? emulate).? ?In? any? event,? I? would? not? use a SSR...for? applying 240? vac....? nor? ?esp shunting a step? start? R.? ?

Small? ?surplus? 3 pole? contactors (like 10- 20-30A? contacts)? ?are? readily? available..... and for? ham? use,? only? 2? poles? are used,? to? apply? 240? vac.

One? thing? I? do? on? the external? step? start? setup? for the? L4B's..... when? done? for? the? night, I? 1st? switch? the? step? start? resistor? back inline... then? shut off the main dpdt? relay.? ?Any? back? emf? from? the? plate xfmr? primary? has? to? 1st get? past? the? step? start? resistor.? The? step? start? resistor? kills the? back? emf? dead....and? zero? arcing? when? main? DPST? relay releases.? ?Contactors? split? any? arc? into? 2 x simultaneous..=? minimal? to? no? ? arcs...since? each? pole of? a? contactor? is? just a? spst-DM arrangement...(2? contacts? with? a bar? coming? down? on? em).? ?The? spring? in a? contactor? is? stiff,? to? enable a fast? release. Flip side? is....? a? huge? amount? of? magnetism? is? ?required...hence? the? solenoid.

Jim? VE7RF? ? ?

? ? ? ?

Re: Question about Ameritron AL-1200 Amp (Uses one 3CX1200Z7 tube)

#37129

How about a pair of these boys before the step-start resistors
 ( zero-crossing )

then a delayed high amperage contactor that shorts across both the SSR
and resistors.

Don W4DNR

Quoting Jim VE7RF <jim.thom@...>:

Show quoted text

If a? big? arc occurs? when? contacts? closing,? something? is? not?
designed? correctly.? ?That? is? no place? for? puny? 10-20 A?
rated? contacts,? or? using real? short? delays.? Just? increasing?
the delay? a? bunch? would? go a long? way? to minimizing the? arc.

Jim? VE7RF

Re: Question about Ameritron AL-1200 Amp (Uses one 3CX1200Z7 tube)

#37128

If a? big? arc occurs? when? contacts? closing,? something? is? not? designed? correctly.? ?That? is? no place? for? puny? 10-20 A? rated? contacts,? or? using real? short? delays.? Just? increasing? the delay? a? bunch? would? go a long? way? to minimizing the? arc.?
?
Jim? VE7RF

Re: Question about Ameritron AL-1200 Amp (Uses one 3CX1200Z7 tube)

Cliff Fox (KU4GW)

#37127

Hi Don,
? ? ? ? ? ? That info is in the user manual page 13 for the schematic and page 14 for the parts list available fore free from the Ameritron website at??and also available free of charge at?

Very 73,
Cliff - KU4GW