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Re: [Amps] 4 x Glass Glowing tubes

To: <>, <>
Subject: Re: [Amps] 4 x Glass Glowing tubes
From: Máximo EA1DDO_HK1H <>
Date: Mon, 27 Feb 2012 10:37:48 +0000
List-post: <">>
Hi all, Bill,

Yes, Bill is right. 
I am not looking for just watts. I don´t want a closed box with ceramic tubes 
inside (I already own one).
What I would like to get is a beauty looking amp with good/high quality audio, 
based on glass tubes.

Let me change the question.

What tubes do you recomend to me to build a 14 MHz monoband amp from these; 
GU48/833A, GU81M or GU5B?

GU5b (triode) is powerfull, cheap and AB2 class quality, the only issue is the 
blower/noise they need.
GU81M, tetrode, are cheap, and I guess has quality as well, no blower (or small 
one), but tetrode needs more power supplies
GU48/833A, (triode), are cheap, B class, unstable?

It could be just monoband amp, for 14 MHz, may be I can add 7 MHz later on.
Thinking in 4 tubes to get blowing glass enough and power between 4 to 10 Kw).

Any other glass tube?
Any recomendation?

Thank you very much

73, Maximo


> From:
> To:;
> CC:
> Date: Mon, 27 Feb 2012 03:03:03 -0500
> 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:
> 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;
> Gates BC-1g is an example too;
> 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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