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

[Carl]

In grid driven AB1 there better not be any drive power unless its swamped 
grid.

I was talking about AB2 or B GG. Not sure what the linearity would be like.

Carl
KM1H


----- Original Message ----- 
From: "Fuqua, Bill L" <wlfuqu00 at uky.edu>
To: "Carl" <km1h at jeremy.mv.com>; "M¨¢ximo EA1DDO_HK1H" <ea1ddo at hotmail.com>
Cc: <amps at contesting.com>
Sent: Monday, February 27, 2012 12:22 PM
Subject: RE: [Amps] 833A/GU-48 x4 Amp support


> 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 at contesting.com [amps-bounces at contesting.com] On Behalf 
> Of Fuqua, Bill L [wlfuqu00 at uky.edu]
> Sent: Monday, February 27, 2012 12:12 PM
> To: Carl; M¨¢ximo EA1DDO_HK1H
> Cc: amps at 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 at jeremy.mv.com]
> Sent: Monday, February 27, 2012 10:06 AM
> To: Fuqua, Bill L; M¨¢ximo EA1DDO_HK1H
> Cc: amps at 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 at uky.edu>
> To: "Hsu" <hsu4qro at gmail.com>; "M¨¢ximo EA1DDO_HK1H" <ea1ddo at hotmail.com>
> Cc: <amps at 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
>>
>> -----ԭʼÓʼþ-----
>> From: M¨¢ximo EA1DDO_HK1H
>> Sent: Sunday, February 26, 2012 6:00 AM
>> To: amps at 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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