Now dont you start Alek...you are one of the Aussies I actually like!
AND who doesnt speak like some overblown ego Brit in order to cover incompetence...or is it incontinence?
Carl
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----- Original Message ----- From: Alek Petkovic vk6apk@... [ham_amplifiers] To: ham_amplifiers@... Sent: Saturday, May 25, 2019 9:16 PM Subject: Re: [ham_amplifiers] Test Somebdy has forgotten to take their pills today. Bad boy Carl. :-) Alek. VK6APK On 26/05/2019 9:02 AM, 'Carl' km1h@... [ham_amplifiers] wrote: YAWN At least Rich and I were friends since about 1996 and I miss him I cant say the same about you. Go back under your GU-74B rock and behave Carl ----- Original Message ----- From: 'Leigh Turner' invertech@... [ham_amplifiers] To: [email protected]Sent: Saturday, May 25, 2019 8:41 PM Subject: RE: [ham_amplifiers] Test Indeed Joe, the forum has been quite slow since the sad demise of central protagonist Rich Measures and the Rich / Carl sideshow jousts... There's more interesting activity on the Amps group nowadays. Leigh VK5KLT From: [email protected] [mailto:ham_amplifiers@...] Sent: Sunday, 26 May 2019 10:03 AM To: [email protected]Subject: RE: [ham_amplifiers] Test No, not dead, been a bit slow, but not slow enough to worry. Joe - W7RKN -----Original Message----- From: ham_amplifiers@... [mailto:ham_amplifiers@...] Subject: [ham_amplifiers] Test Canada; the ship of fools where corruption and politics are synonymous Ham Amplifiers reflector dead? Virus-free. www.avg.com -- From sunny Binningup Family Businesses: SP Electrical. www.spelectrical.net.au The Velvet Fox. Smart Design Electrical. Perth Interiors. --- This email has been checked for viruses by AVG.
|
Kinda like Popeye and Bluto friendhip. Sent from AOL Mobile Mail
Get the new AOL app:
?
YAWN
?
At least Rich and I were friends since about 1996
and I miss him
?
I cant say the same about you. Go back under your
GU-74B rock and behave
?
Carl
?
?
?
?
----- Original Message -----
Sent: Saturday, May 25, 2019 8:41
PM
Subject: RE: [ham_amplifiers] Test
?
Indeed
Joe, the forum has been quite slow since the sad demise of central protagonist
Rich Measures and the Rich / Carl sideshow
jousts¡..
There¡¯s
more interesting activity on the Amps group
nowadays.
Leigh
VK5KLT
?
No, not dead, been a bit slow, but not slow enough to
worry.
Joe - W7RKN
-----Original Message-----
From:
ham_amplifiers@...
[mailto: ham_amplifiers@... ]
Subject:
[ham_amplifiers] Test
Canada ; the ship of fools
where corruption and politics are synonymous
Ham Amplifiers reflector
dead?
|
>But on the subject of the venerable GU74B tube we contraire with diametrically opposite opinion.? >This little tetrode is the best ham radio amplifier tubes around; on the proviso it¡¯s used properly and >within its ratings¡.. as evidenced by amp manufacturers like Acom in their immensely popular and >well received family of 1 and two tube amplifiers, as well as others, and hordes of amplifier >homebrewers. ?
>Leigh
##? Why even mess with a tetrode ?? ? My? problem with? the? ?GU74B ......" 4CX-800"? ?is the? ski? high? 225? ma? idle? current requirement? ? PER? TUBE !? ? And that's? just? to get the? IMD? to? acceptable levels.? ? That's? ?insane.? ?450 ma for a pair...and? ?675 ma for a 3 holer.?
##? Don't? mess? with? the Acom? ?SS? amps.....? way too? many problems... and? no? qsk.??
##? Leigh,? ? with? ?your 400? W? limit,? ?anything? will? last a long? ?time.? ?With a 400? w? limit,? a? SS? amp would suffice.?
Jim? ?VE7RF??
|
Agree
about the sad loss of Rich there Carl.
?
But on
the subject of the venerable GU74B tube we contraire with diametrically
opposite opinion.? This little tetrode is the best ham radio amplifier tubes
around; on the proviso it¡¯s used properly and within its ratings¡..
as evidenced by amp manufacturers like Acom in their immensely popular and well
received family of 1 and two tube amplifiers, as well as others, and hordes of amplifier
homebrewers.
?
73
?
Leigh
?
From:
ham_amplifiers@...
[mailto:ham_amplifiers@...]
Sent: Sunday, 26 May 2019 10:33 AM
To: ham_amplifiers@...
Subject: Re: [ham_amplifiers] Test
?
?
At least Rich and I were friends since about 1996 and I miss
him
I cant say the same about you. Go back under your GU-74B
rock and behave
toggle quoted message
Show quoted text
----- Original Message -----
Sent: Saturday, May 25,
2019 8:41 PM
Subject: RE:
[ham_amplifiers] Test
?
Indeed Joe, the forum has been quite slow since
the sad demise of central protagonist Rich Measures and the Rich / Carl
sideshow jousts¡..
There¡¯s more interesting activity on
the Amps group nowadays.
Leigh
VK5KLT
?
No, not dead, been a bit slow, but not slow enough to
worry.
Joe - W7RKN
-----Original Message-----
From: ham_amplifiers@...
[mailto:ham_amplifiers@...]
Subject: [ham_amplifiers] Test
Canada;
the ship of fools where corruption and politics are synonymous
Ham Amplifiers reflector dead?
|
I have a GU-78B that has developed a grid short. I have determined the grid
short initiates about 2 minutes after power on and ends after about 5
minutes.
I have tried unsuccessfully to 'burn' the short by hooking up a 560?f
capacitor fed with 300vdc.
What other methods that can be tried to 'burn' this short?
Doug
|
Somebdy has forgotten to take their pills today.
Bad boy Carl. :-)
Alek.
VK6APK
On 26/05/2019 9:02 AM, 'Carl' km1h@... [ham_amplifiers]
wrote:
YAWN
?
At least Rich and I were friends
since about 1996 and I miss him
?
I cant say the same about you. Go
back under your GU-74B rock and behave
?
Carl
?
?
?
?
-----
Original Message -----
Sent:
Saturday, May 25, 2019 8:41 PM
Subject:
RE: [ham_amplifiers] Test
?
Indeed
Joe, the forum has been quite slow since the sad demise of central
protagonist Rich Measures and the Rich / Carl sideshow jousts¡..
There¡¯s
more interesting activity on the Amps group nowadays.
Leigh
VK5KLT
?
No, not dead, been a bit slow,
but not slow enough to worry.
Joe - W7RKN
-----Original Message-----
From: ham_amplifiers@... [mailto:ham_amplifiers@...]
Subject: [ham_amplifiers] Test
Canada; the ship of fools where corruption
and politics are synonymous
Ham Amplifiers reflector dead?
--
From sunny Binningup
Family Businesses:
SP Electrical.
The Velvet Fox.
Smart Design Electrical.
Perth Interiors.
|
Like I said something is filtering posts.
I can post a test message only.
Doug
Canada; the ship of fools where corruption and politics are synonymous
|
Let's try this post for the 3rd time and see if it comes
through.
?
I
have a GU-78B that has developed a grid short. I have determined the grid short
initiates about 2 minutes after power on and ends after about 5 minutes.
I
have tried unsuccessfully to 'burn' the short by hooking up a 560?f capacitor
fed with 300vdc.
What
other methods that can be tried to 'burn' this short?
Doug
?
|
Other than one of my test e-mails getting
through, other posts have not.
Something is screwed up!
And nothing is coming through on the Amps
reflector either.
Doug
?
"The difference between stupidity and genius is that genius
has its limits." Albert Einstein
From:
ham_amplifiers@... [mailto:ham_amplifiers@...]
Sent: May-25-19 6:42 PM
To: ham_amplifiers@...
Subject: RE: [ham_amplifiers] Test
?
?
?
Indeed Joe, the forum has been quite slow since
the sad demise of central protagonist Rich Measures and the Rich / Carl
sideshow jousts¡..
?
There¡¯s more interesting activity on the
Amps group nowadays.
?
Leigh
VK5KLT
?
toggle quoted message
Show quoted text
From: ham_amplifiers@...
[mailto:ham_amplifiers@...]
Sent: Sunday, 26 May 2019 10:03 AM
To: ham_amplifiers@...
Subject: RE: [ham_amplifiers] Test
?
No, not dead, been a bit slow, but not slow enough to
worry.
Joe - W7RKN
-----Original Message-----
From: ham_amplifiers@... [mailto:ham_amplifiers@...]
Subject: [ham_amplifiers] Test
Canada;
the ship of fools where corruption and politics are synonymous
Ham Amplifiers reflector dead?
|
YAWN
?
At least Rich and I were friends since about 1996
and I miss him
?
I cant say the same about you. Go back under your
GU-74B rock and behave
?
Carl
?
?
?
?
toggle quoted message
Show quoted text
----- Original Message -----
Sent: Saturday, May 25, 2019 8:41
PM
Subject: RE: [ham_amplifiers] Test
?
Indeed
Joe, the forum has been quite slow since the sad demise of central protagonist
Rich Measures and the Rich / Carl sideshow
jousts¡..
There¡¯s
more interesting activity on the Amps group
nowadays.
Leigh
VK5KLT
?
No, not dead, been a bit slow, but not slow enough to
worry.
Joe - W7RKN
-----Original Message-----
From:
ham_amplifiers@...
[mailto:ham_amplifiers@...]
Subject:
[ham_amplifiers] Test
Canada; the ship of fools
where corruption and politics are synonymous
Ham Amplifiers reflector
dead?
|
?
Indeed
Joe, the forum has been quite slow since the sad demise of central protagonist Rich
Measures and the Rich / Carl sideshow jousts¡..
?
There¡¯s
more interesting activity on the Amps group nowadays.
?
Leigh
VK5KLT
?
From:
ham_amplifiers@...
[mailto:ham_amplifiers@...]
Sent: Sunday, 26 May 2019 10:03 AM
To: ham_amplifiers@...
Subject: RE: [ham_amplifiers] Test
?
No, not dead, been a bit slow, but not slow enough to
worry.
Joe - W7RKN
toggle quoted message
Show quoted text
-----Original Message-----
From: ham_amplifiers@...
[mailto:ham_amplifiers@...]
Subject: [ham_amplifiers] Test
Canada;
the ship of fools where corruption and politics are synonymous
Ham Amplifiers reflector dead?
|
No, not dead, been a bit slow, but not slow enough to worry.
Joe - W7RKN
toggle quoted message
Show quoted text
-----Original Message-----
From: ham_amplifiers@... [mailto:ham_amplifiers@...]
Subject: [ham_amplifiers] Test
Canada; the ship of fools where corruption and politics are synonymous
Ham Amplifiers reflector dead?
|
Beep...beep...beep...beep...beep...
-----Original Message-----
From: 'Doug Renwick' ve5ra@... [ham_amplifiers]
To: ham_amplifiers
Sent: Sat, May 25, 2019 1:12 pm
Subject: [ham_amplifiers] Test
?
Canada; the ship of fools where corruption and politics are synonymous
Ham Amplifiers reflector dead?
---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus
|
Test # 2 Removing grid shorts
I
have a GU-78B that has developed a grid short. I have determined the grid short
initiates about 2 minutes after power on and ends after about 5 minutes.
I
have tried unsuccessfully to 'burn' the short by hooking up a 560?f capacitor
fed with 300vdc.
What
other methods that can be tried to 'burn' this short?
Doug
?
|
OK the reflector is working now. Before, my message
disappeared.
?
I
have a GU-78B that has developed a grid short. I have determined the grid short
initiates about 2 minutes after power on and ends after about 5 minutes.
I
have tried unsuccessfully to 'burn' the short by hooking up a 560?f capacitor
fed with 300vdc.
What
other methods that can be tried to 'burn' this short?
Doug
?
|
Canada; the ship of fools where corruption and politics are synonymous
Ham Amplifiers reflector dead?
|
?
Did you try tuning the choke about 30 Hz
higher?
?
Carl
?
?
----- Original Message -----
Sent: Friday, May 24, 2019 3:17 PM
Subject: [ham_amplifiers] Re: C-L-C
update
?
I? made a serious? error? when plugging numbers into the
PSUD-2? ?power supply software.? Like an idiot,? I used
the? wrong? plate xfmr? ?DC? primary?
resistance.? I was plugging in? ".1 ohm"..... when it shoulda
been? ",01 ohm" .? ? ?Well that? makes a
helluva? difference? to the calculated? ?source?
Z? of the? plate? xfmr.??
I did have the? secondary? ?DC? resistance correct
though? ( 4.5 ohms? across the 3900? tap....and? 6 ohms
across the? 5200? tap).?
On the 3900 tap, source? Z? is actually? just 7.411?
ohms.....? and? NOT? ?33.61? ohms.?
??
On the? 5200? tap,? source Z? ?is actually just
11.61? ohms.... and NOT? ? 57.6? ohms.?
B+? ?V drops? under a steady...or? varying load are
of course? much improved.? ?Hardly any drop at all.?
The resonant choke? setup is still? a dud? though.?
?It's? a glorified? 120 hz? notch? filter...and let's
all the? harmonics? pass on through.? ??
Too? easy to make? errors.?
Jim? VERF?
|
I? made a serious? error? when plugging numbers into the PSUD-2? ?power supply software.? Like an idiot,? I used the? wrong? plate xfmr? ?DC? primary? resistance.? I was plugging in? ".1 ohm"..... when it shoulda been? ",01 ohm" .? ? ?Well that? makes a helluva? difference? to the calculated? ?source? Z? of the? plate? xfmr.??
I did have the? secondary? ?DC? resistance correct though? ( 4.5 ohms? across the 3900? tap....and? 6 ohms across the? 5200? tap).?
On the 3900 tap, source? Z? is actually? just 7.411? ohms.....? and? NOT? ?33.61? ohms.? ??
On the? 5200? tap,? source Z? ?is actually just 11.61? ohms.... and NOT? ? 57.6? ohms.?
B+? ?V drops? under a steady...or? varying load are of course? much improved.? ?Hardly any drop at all.?
The resonant choke? setup is still? a dud? though.? ?It's? a glorified? 120 hz? notch? filter...and let's all the? harmonics? pass on through.? ??
Too? easy to make? errors.?
Jim? VERF?
|
Ok, here is why a....? C1 -? resonant choke -? C2? cap is? 1 step forward and? ?6 steps backwards.?? Ditto? with a? classic? ( henry radio style)? ?.. resonant choke -? Cap? config.?
When you resonate the choke, at 120 hz,? ?you now have a glorified? 120 hz? notch filter.? ? You no longer have a? good? LP filter, with a low freq? cut off.? ? Reason is.... the small cap that's in parallel with the choke (used to resonate the choke)? will? simply pass all the? harmonics, like? 240/360/480/ 600? hz? ?etc, etc.??
Typ value parallel? resonating caps have low? XC? at? >240 hz.? ?The ONLY thing that is killing the harmonics is the cap on either side of the choke ( in the case of a C-? resonant choke - C filter).......? or the output cap ( in the case of a? ...Resonant choke -? C filter.? ?Ok, now you know why? FM broadcast? TX..that use the? classic? ?resonant choke +? cap setup.... also follow it up with a? 2nd choke? +? 2nd cap.? ?The? 2nd choke (NOT resonated)? ?+? 2nd cap is? there strictly to kill the harmonics.? ?Now in essence? they end up with a resonant choke notch filter..... followed by a? ?C-LC? filter.??
With a simple? ?C- choke - C? ?filter.... it forms a bonafide? real deal? LP? filter..with a real low freq? cut off.? ?In my case, the? cut off freq is real low, like 3.7 hz.? ? ?Attenuation at 120 hz? is? -131 db ... and lower still on the? harmonics? at? 240/360/480/600/ etc.? ? ? Max? gross overkill,? I like it.? ? So do the glass tube? audio geeks.
I can see why the FM broadcast folks? want? loads of? 120..and also? 240/360/480? etc? ?harmonic redux? (this is on single phase? B+? supplies).? ? FM is about the only mode I can think of, that sucks max plate current.... with no modulation / audio / program? material /? music? applied to the TX.? ?IE:? 100 kw? ERP? and during pauses? etc, if there is any 120/240/360? etc products, they? will be heard on the RX end.? ?Esp if the? 100 kw erp station is fairly local,? full quieting, and? S meter? pegged.?
A few folks? tried? 75M? ?FM late one night..that was an eye opener.? ?Locally,? FM is used on 11 M band !?
later.... Jim? ?VE7RF
|
Re: 6 Meters Parasitic for 3-500Z
Hi Jim,?
Sorry about the late answer.
I ending? 1300W with 70W amp and grid current on the limit.? I will keep it like this for now.
Several coil have been tested and the last one was the best compromise, btw i not and tested the L to cancel the C of tube.. i have put so much time in this box.. i want it to go :)? ?This is for a friend,.
The YC-156 is not a 6M amp, it is a HF low band.? I have a 4400 V 2A CCS Xformer, rectifier diode from a FM transmitter and 26 uF 7500V oil cap for HV.
Pi Net will be like many, roller inductor + variable Vac Capacitor for both..nothing fancy but i can't wait to see? and what will be the output and IMD ( with and without Puresignal).? This amp will be used with a ANAN 8000 exciter the 200W out will help for sure.
Guillaume
|
Leigh Turner