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. http://tubedata.tubes.se/sheets/018/g/GU5B.pdf
GU81M, tetrode, are cheap, and I guess has quality as well, no blower (or small
one), but tetrode needs more power supplies
http://tubedata.tubes.se/sheets/018/g/GU81M.pdf
GU48/833A, (triode), are cheap, B class, unstable?
http://tubedata.tubes.se/sheets/018/g/GU48.pdf
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: wlfuqu00@uky.edu
> To: hsu4qro@gmail.com; ea1ddo@hotmail.com
> CC: amps@contesting.com
> 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: 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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