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

To: Máximo EA1DDO_HK1H <>
Subject: Re: [Amps] 833A/GU-48 x4 Amp support
From: "Hsu" <>
Date: Mon, 27 Feb 2012 05:11:52 +0800
List-post: <">>
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 
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 

From: Máximo EA1DDO_HK1H
Sent: Sunday, February 26, 2012 6:00 AM
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 
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?

Thank you very much

73, Maximo - EA1DDO

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