Hi Maximo,
i have not heard about 4-1000A being used at AF :)
But, that is a beast in apperance, definetelly .
Maybe some other European types, such as Philips QB-5/1750, i know
the guy who sale them for close to 100,00 Euro., in Croatia.
Brand new, never used ( military NOS ).
Rgds,
Nermin S58DX
(Maximo, they used to say :" Real radio's glow in the dark " :)
Oh well, those were the times, heating, who the hell needs a heating in
winter !
----- Original Message -----
From: "Máximo EA1DDO_HK1H" <ea1ddo@hotmail.com>
To: <wlfuqu00@uky.edu>; <amps@contesting.com>
Sent: Monday, February 27, 2012 11:37 AM
Subject: Re: [Amps] 4 x Glass Glowing tubes
>
> 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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