Re: Kenwood TL-922-Need a plate current meter.
Hello Lou, ? If I’m not mistaken you were active on the Yahoo TL-922 list a few years ago, and we exchanged some messages. I looked for your email address in my Outlook client but couldn't find it. Then I was lucky enough to find this group and just signed up yesterday. ? I understand the plate current meters are not available new. I’m searching eBay for one, but who knows if one will show up or not. I will contact you about getting a meter. ? I don’t think a tube suffered, as the RF meter and my external meters still show good output. I am, however, getting minimal readings on the Ig meter. About 15 mA on the 400 mA scale. ? Jim McPhee Placitas, NM W5ABA ?
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From: [email protected] < [email protected]> On Behalf Of Louis Parascondola via groups.io Sent: Monday, August 21, 2023 6:12 AM To: [email protected]Subject: Re: [ham-amplifiers] Kenwood TL-922-Need a plate current meter. ? Plate current meters are not available new. The only hope of getting one is to find someone parting out an amp and selling off parts. ?The only other alternative I know of is to purchase a meter from me. ?Years ago when faced with repairing 922 amps with blown meters like yours I?could never find a replacement original meter in a timely fashion. ?I was forced to do something. ?After hours upon hours of investigation I finally came up with a solution that I would say is 98 % effect. ?I found a meter and worked it over and by only changing R7 with a different resistor that I supply it is a great alternative. ?I’ve sold and replaced a few dozen meters over the years with raved responses to an almost impossible situation. ?If you can’t find anything and want the quickest solution, send me an email off list to obtain one. ?I might add that you probably had a tube or tubes that short plate to grid and that’s the reason for frying all those parts, if you grids are not grounded you probably also burned up a grid choke. ?I have those too. ?There are mods for protecting meters that you should implement going forward. ?I recommend ?replacing the bad tube(s) that probably caused that event. Lou
? On Monday, August 21, 2023, 12:50 AM, Jim McPhee <jmcphee@...> wrote: A recent event of unknown cause or origin has totaled the existing plate current meter. I have replaced R5, R6, and R7 (R6 was toast). Diodes D2 and D7 are on there way and will be replaced upon arrival, although I have not tested the existing ones to determine if they are faulty.
Does anyone have a Ip meter available?
Jim McPhee
Placitas, NM
W5ABA
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Re: Kenwood TL-922-Need a plate current meter.
Jim, I have one of Lou's meters in my 922. You almost can't tell it's replaced. Let me know if u want a pic. Bob W4JFA?
On Mon, Aug 21, 2023, 8:12 AM Louis Parascondola via <Gudguyham= [email protected]> wrote:
Plate current meters are not available new. The only hope of getting one is to find someone parting out an amp and selling off parts.? The only other alternative I know of is to purchase a meter from me.? Years ago when faced with repairing 922 amps with blown meters like yours I?could never find a replacement original meter in a timely fashion.? I was forced to do something.? After hours upon hours of investigation I finally came up with a solution that I would say is 98 % effect.? I found a meter and worked it over and by only changing R7 with a different resistor that I supply it is a great alternative.? I’ve sold and replaced a few dozen meters over the years with raved responses to an almost impossible situation.? If you can’t find anything and want the quickest solution, send me an email off list to obtain one.? I might add that you probably had a tube or tubes that short plate to grid and that’s the reason for frying all those parts, if you grids are not grounded you probably also burned up a grid choke.? I have those too.? There are mods for protecting meters that you should implement going forward.? I recommend ?replacing the bad tube(s) that probably caused that event. Lou
On Monday, August 21, 2023, 12:50 AM, Jim McPhee <jmcphee@...> wrote: A recent event of unknown cause or origin has totaled the existing plate current meter. I have replaced R5, R6, and R7 (R6 was toast). Diodes D2 and D7 are on there way and will be replaced upon arrival, although I have not tested the existing ones to determine if they are faulty.
Does anyone have a Ip meter available?
Jim McPhee
Placitas, NM
W5ABA
|
Re: Kenwood TL-922-Need a plate current meter.
Plate current meters are not available new. The only hope of getting one is to find someone parting out an amp and selling off parts. ?The only other alternative I know of is to purchase a meter from me. ?Years ago when faced with repairing 922 amps with blown meters like yours I?could never find a replacement original meter in a timely fashion. ?I was forced to do something. ?After hours upon hours of investigation I finally came up with a solution that I would say is 98 % effect. ?I found a meter and worked it over and by only changing R7 with a different resistor that I supply it is a great alternative. ?I’ve sold and replaced a few dozen meters over the years with raved responses to an almost impossible situation. ?If you can’t find anything and want the quickest solution, send me an email off list to obtain one. ?I might add that you probably had a tube or tubes that short plate to grid and that’s the reason for frying all those parts, if you grids are not grounded you probably also burned up a grid choke. ?I have those too. ?There are mods for protecting meters that you should implement going forward. ?I recommend ?replacing the bad tube(s) that probably caused that event. Lou
On Monday, August 21, 2023, 12:50 AM, Jim McPhee <jmcphee@...> wrote: A recent event of unknown cause or origin has totaled the existing plate current meter. I have replaced R5, R6, and R7 (R6 was toast). Diodes D2 and D7 are on there way and will be replaced upon arrival, although I have not tested the existing ones to determine if they are faulty.
Does anyone have a Ip meter available?
Jim McPhee
Placitas, NM
W5ABA
|
Kenwood TL-922-Need a plate current meter.
A recent event of unknown cause or origin has totaled the existing plate current meter. I have replaced R5, R6, and R7 (R6 was toast). Diodes D2 and D7 are on there way and will be replaced upon arrival, although I have not tested the existing ones to determine if they are faulty.
Does anyone have a Ip meter available?
Jim McPhee
Placitas, NM
W5ABA
|
Re: Looking for data on an Eimax Y-685A
I have several of these modules, they all use the same tube so no worries there.
The cylindrical metal piece the tube screws into is electrically connected to the anode, but the actual heatsink isn't. It's actually at ground potential when the tube is in position. The brown coloured disk is some kind of insulator that's thermally conductive. Not sure what the material is... I thought it might be beryllium but its not the right colour.
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Re: Looking for data on an Eimax Y-685A
The heatsink appears to be 50X the size of the tube.? How much stray C is that heatsink alone going to add to the circuit ??
Whether it's the Y-685A? ?or any other tube, I would suggest obtaining at least 2 x known good tubes before embarking on a project.? ?It's too much effort into the amp, with only one available tube.?
Ditto with YC-156's.... or any other tube.??
At least with the bigger metal triodes, like the 3x3, 3x6 etc, they can still be rebuilt.?
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Re: Gonset 201 mk3 80-10 amp. ( hv tranny needed )
I wonder if there are any shops that would rewind it? Bob W4JFA?
Hi Don.? I wonder if you ever located one of these transformers.? I had one of those amps about 50 years ago and used it for years.? I see that Hammond Manufacturing, who bought out the Peter Dahl line, has the transformer in stock.? You can check their website and look at the Gonset listings to find it.? No idea what the price is, but the specs are all there.? Good luck!
73, Floyd - K8AC
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Re: Looking for data on an Eimax Y-685A
Reid, thank you very much for looking that up. The info is greatly appreciated!
Fortunately I still have the intact device that it was in, it was fully functional. The MCL 15222 generator achieves 100 watts... which is curious because the datasheet for the 8906 rates it at only 10 watts plate dissipation and 30 watts output!
I assume the rather large non-standard heatsink has a lot to do with that difference.
I shall do some more research and proceed with caution, thank you.
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Re: Gonset 201 mk3 80-10 amp. ( hv tranny needed )
Hi Don.? I wonder if you ever located one of these transformers.? I had one of those amps about 50 years ago and used it for years.? I see that Hammond Manufacturing, who bought out the Peter Dahl line, has the transformer in stock.? You can check their website and look at the Gonset listings to find it.? No idea what the price is, but the specs are all there.? Good luck!
73, Floyd - K8AC
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Re: Looking for data on an Eimax Y-685A
Eimac history shows: 03/73 Y685A is an 8906XAL special, for MCL generator"
the -AL suffix indicated a tube made for the Airlines, they used a lot of planar triodes in the past for short range navigation equipment.
For electrical specs look up 8906.?
the time and energy required to build a 23cm cavity would be wasted if the tube was weak, or if you don't have a source for a spare.
GL with the search.?
Reid W6MTF
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Dear Alek,
Thank you for the kind words.
Hal
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Yeah, thanks Hal. You're a man after my own heart.
I have been fortunate to be able to help others in a similar way over the years and I've also been on the receiving end many times. I've met a lot of nice people that way.
Any relation to guitarist Harvey Mandel?
73, Alek. VK6APK
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On 16/08/2023 11:45 pm, HaL Mandel wrote: Dear Alek,
Read your quest for the power meter manual, and herein certainly wish you
success.
Some chap wrote me the other day, looking for the manual for a 10KW
ATU that was only manufactured for a few months many years ago.
He saw a picture of one in my science trailer on some such Internet URL
and took the effort to find my address. Yes, I had a manual and I got a copy
to him for nothing. In color, blah, blah. I was so glad to help someone, and
if I had this manual you are looking for I would get a copy to you, directly.
Fondly,
Hal Mandel
W4HBM
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Not quite.? ?It's a water cooled tube, not vapour phase cooled.? ?Air cooling is good for 50 watts per sq CM of internal anode area.? ?Vapour phase cooling is good for 135 watts of internal anode area. Water cooling is good for 1000 watts of internal anode area.?
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Jim,
?
It’s like having an Alpha Stanley Steamer on the bench.
?
Gurgle, gurgle.
?
Hal Mandel
W4HBM
?
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From: [email protected] < [email protected]>
On Behalf Of Jim VE7RF
Sent: Wednesday, August 16, 2023 12:16 PM
To: [email protected]
Subject: Re: [ham-amplifiers] Eimac YU-191B
?
The YU-106 appears to be a just 3-4 wraps of 3/8"? copper tubing wrapped around the anode.?
The YU-191B? is the real deal, with the coffee can around the anode.... just like all the other water cooled tubes.??
2-3 years ago, several appeared on the used market..... and several? hb HF amps were built using them.? ?I forget what the required water flow rates were.? The folks were using distilled water, external pump, external air cooled radiator ( shrouded between
fan and radiator), and once they got the cooling optimized, the amps worked very well.??
?
The beauty was...... there was no noise, nor heat in the shack.? Some of the folks had the hot air from the? radiator exhaust? routed to the outside in hot wx.? ?And routed to the inside in winter.? ?As long as no leaks anywhere, and safety interlocks used,
it works fine.? ?IE: with loss of water flow, reduced water flow, water too hot entering the tube, everything shuts down asap, including opening off key line, and shutting the fil off.
?
Note forced air is still required to cool the fil.? 7.5 vac @ 50 amps =? 375 watts.?
?
It's a superb tube....and afaik, it's still rebuildable per Econco. .?
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Looking for data on an Eimax Y-685A
edit: obviously I'm an idiot and didn't realize the typo in the title... Eimac not Eimax... ? Hi all, wondering if anyone has any data on this tube? Potential candidate for a 23cm amp. This came out of a resonant cavity in a 100watt signal generator (this specific module was good for 400-1000MHz). Can't find any data on it, looks similar to a Y-503 but not quite. Have searched through a bunch of Eimac catalogs and found similar planar triodes but not this one. Would like to have some concrete data. Anyone familiar with this? Thanks! 73   
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The YU-106 appears to be a just 3-4 wraps of 3/8"? copper tubing wrapped around the anode.?
The YU-191B? is the real deal, with the coffee can around the anode.... just like all the other water cooled tubes.??
2-3 years ago, several appeared on the used market..... and several? hb HF amps were built using them.? ?I forget what the required water flow rates were.? The folks were using distilled water, external pump, external air cooled radiator ( shrouded between fan and radiator), and once they got the cooling optimized, the amps worked very well.??
?
The beauty was...... there was no noise, nor heat in the shack.? Some of the folks had the hot air from the? radiator exhaust? routed to the outside in hot wx.? ?And routed to the inside in winter.? ?As long as no leaks anywhere, and safety interlocks used, it works fine.? ?IE: with loss of water flow, reduced water flow, water too hot entering the tube, everything shuts down asap, including opening off key line, and shutting the fil off.
?
Note forced air is still required to cool the fil.? 7.5 vac @ 50 amps =? 375 watts.?
?
It's a superb tube....and afaik, it's still rebuildable per Econco. .?
|
Dear Alek,
Read your quest for the power meter manual, and herein certainly wish you
success.
Some chap wrote me the other day, looking for the manual for a 10KW
ATU that was only manufactured for a few months many years ago.
He saw a picture of one in my science trailer on some such Internet URL
and took the effort to find my address. Yes, I had a manual and I got a copy
to him for nothing. In color, blah, blah. I was so glad to help someone, and
if I had this manual you are looking for I would get a copy to you, directly.
Fondly,
Hal Mandel
W4HBM
|
This is a really long shot.
I am looking for a user manual and more importantly, a schematic for a "Agikawa APM-1H" automatic SWR and peak reading power meter, 1-8 ~ 60MHz.
One is pictured here.
It looks exactly the same as the Macaw PRM-1, for which I have the manual and schemnatic but the active circuitry inside is completely different.
Searches via Google and BAMA have drawn a blank, so I'm hoping somebody might have owned one in the past and still knows where to find the documentation.
I have changed the 2 ICs and 4 transistors. All the diodes check out fine as well but the fault persists. When switched to "PEP", the meter pins on 200W scale and shows around 400W on the 1000W and 2000W scales, without anything being connected to the device.
I would really appreciated any leads, so I can repair it and pass it on to a friend who is getting back into the hobby after many years away.
Thanks and 73, Alek VK6APK.
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While working at Eimac San Carlos I wasn't involved with the Salt Lake City products but I have product announcements for both sites.
"Oct 1989. The YU-191B was a version of the YU106 a water cooled 3CX3000A7, with a special water jacket for Ehrhorn"
A YU-191B should perform exactly the same as a 3000A7 except needing a flow of water thru the anode cooler to keep it from melting down.?
Reid? W6MTF
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Hey Bob – I knew the 3CX1200s were tough little bastards, but I never knew they glowed as bright as that ! Very cool ! ?
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From: [email protected] <[email protected]> On Behalf Of Robert W5AJ
Sent: Friday, August 11, 2023 6:25 AM
To: [email protected]
Subject: [ham-amplifiers] 3CX1200 photo? working on AL-1200 today.?? (the HV is off folks)?? Testing filament / blower settings.??? Photo attached of tube with blower/filament on.?? 73
If photo doesn't go through, it's on google photos
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Bob
Floyd - K8AC
Brandon DX
HaL Mandel