Oh, in AB1 all the drive power will go to the output as well.
That is the plan for my 4x 4CX250B amplifier with grounded screen and
control grid connected to cathode. Driven by another 4CX250B with
same configuration.
73
bill wa4lav
________________________________________
From: amps-bounces@contesting.com [amps-bounces@contesting.com] On Behalf
Of Fuqua, Bill L [wlfuqu00@uky.edu]
Sent: Monday, February 27, 2012 12:12 PM
To: Carl; Máximo EA1DDO_HK1H
Cc: amps@contesting.com
Subject: Re: [Amps] 833A/GU-48 x4 Amp support
I like the 304TL eventought the gain is low.
In fact 4 of them should run very linear in class AB1 operation with
no grid current yet provide more than legal limit output for USA.
73
Bill wa4lav
________________________________________
From: Carl [km1h@jeremy.mv.com]
Sent: Monday, February 27, 2012 10:06 AM
To: Fuqua, Bill L; Máximo EA1DDO_HK1H
Cc: amps@contesting.com
Subject: Re: [Amps] 833A/GU-48 x4 Amp support
A pair of 6C21's will do a nice job also. Use 7.5V on the filaments and
with
some healthy air fow you can use 1000T specs. With just a muffin fan treat
them as a 450TL.
If you want the ultimate glow factor its hard to beat a quad of 304TL's
with
about 600W of drive....
Carl
KM1H
----- Original Message -----
From: "Fuqua, Bill L" <wlfuqu00@uky.edu>
To: "Hsu" <hsu4qro@gmail.com>; "Máximo EA1DDO_HK1H" <ea1ddo@hotmail.com>
Cc: <amps@contesting.com>
Sent: Monday, February 27, 2012 3:03 AM
Subject: Re: [Amps] 833A/GU-48 x4 Amp support
I believe he wants 4 glowing plates. Larger the better.
4x 250th would work but a bit expensive compared to the Russan 833.
I once ran 2x 250th in grounded grid driven by a pair of 6146Bs on 20
meters.
So 4 should work.
73
Bill wa4lav
Subject: Re: [Amps] 833A/GU-48 x4 Amp support
I don't think 833A is a good option.As it have long electrode and bad
freqence response. I'm afraid it can not work in 20m in 4X
parallel(self-oscillation).
3CX3000A7/F7 is better. But if you use ACOM2000A as driver, it will over
drive easily.The drivering power is 400W (max) for 3CX3000A7/F7. or you
can
use low/ medium Mu triode
in GG like 3CX3000A1/3CX2500A3..., they need more driving power. Just my
thought.
73!Hsu
-----原始邮件-----
From: Máximo EA1DDO_HK1H
Sent: Sunday, February 26, 2012 6:00 AM
To: amps@contesting.com
Subject: [Amps] 833A/GU-48 x4 Amp support
Hi all,
I am not an amps expert but I am thinking to build an amplifier using 4 x
GU-48.
I guess GU-48 is equivalent to 833A, not sur if all specs are same.
This is trying to get an amp "looking beauty" and good audio quality, it
is
not looking for extremely high power. I already have an amplifier (Acom
2000A) i can use as driver.
Something like this, but HF;
http://www.luxurylaunches.com/entry_images/0511/17/Audio-Power-Labs-833TNT-tube-amplifier-1.jpg
Gates BC-1g is an example too; http://w5ami.net/bc-1t/833.glow2.jpg
It could be monoband amplifier for 20m, perhaps 40m too.
I thought in GU5b and GU-81M before, but I guess GU-48 is better because
needs no specific blower and is triode (easier to build).
Please, Any of you have sperience with this kind of amplifier?
Any squematic?
Recomendations?
Thank you very much
73, Maximo - EA1DDO
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