Re: [Amps] 833A/GU-48 x4 Amp support

["Carl" <km1h@jeremy.mv.com>]

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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