DIY High power Audio Amplifier from Heathkit SB200 - diyAudio
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Old 24th February 2012, 08:46 AM   #1
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Default DIY High power Audio Amplifier from Heathkit SB200

I bought an old Heathkit SB200 Linear amplifier. I want to modify it become a
High power Audio Amplifier. A technical man said me that add 2 x 6V6 tubes into this machine (driver stage) and modify the machine schematic ?
I wonder : 1. Will it be a good and high power audio amplifier ?
2. What is the good parameters of the tube audio output transformer ?
3. Can we decrease the high Mu voltage for the 2 x 572B tubes when modify the amplifier ?
Any one can help me some ideas ?
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Last edited by phamnguyenthethanh; 24th February 2012 at 09:13 AM. Reason: Add pictures
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Old 24th February 2012, 10:22 AM   #2
DF96 is offline DF96  England
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The sensible thing to do is sell it to someone who can make use of it in its proper state, and use the money to buy audio stuff.

It is designed to use a high voltage supply, much higher than a normal valve audio amp. Very dangerous, except for those who really know what they are doing. I suspect, from your questions, that this is not a safe project for you - even if it was a sensible project which it isn't.
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Old 24th February 2012, 11:56 AM   #3
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Default The more acknowledge - the cheaper tube amply I will have

I attend to hire a a technical man does it for me, but I think if any body help me some opinion I will have the best solusion and save much money. Thank you. Please help me, Brothers. In addition, in Vietnam we are not allowed to play the radio waves. I have to modify it for audio amplifier.

Last edited by phamnguyenthethanh; 24th February 2012 at 12:06 PM.
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Old 24th February 2012, 12:44 PM   #4
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it ridiculous to try and convert it to an audio amp. B+ is around 1000volts. Hardly any of the circuitry could be reused. There is no output transformer - where would you get one and where would you put it - plus it's mono!!!! And the tubes may not be that linear - what would you drive it with. It is probably worth around $500US. Sell it

Charles (K1ETU)
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Old 24th February 2012, 02:04 PM   #5
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Default All parts are be ready

I have the heathkit SB200, 2 * 6V6 tubes, 12 kgs of large EI silicon steel using for winding 2 single end output transformers. I would like to build an speacial high power tube amplifier. I found some man had builded 811A and 813 SE tube audio amplifiers with hundreds of watt. Why we cannot? Please help me.
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Old 24th February 2012, 02:35 PM   #6
DF96 is offline DF96  England
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We have told you why you cannot. You just don't like our answer.

Much better to use the 6V6 to make a safe audio amp.
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Old 24th February 2012, 03:09 PM   #7
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Default All parts are be ready

I have the heathkit SB200, 2 * 6V6 tubes, 12 kgs of large EI silicon steel using for winding 2 single end output transformers. I would like to build an speacial high power tube amplifier. I found some man had builded 811A and 813 SE tube audio amplifiers with hundreds of watt. Why we cannot? Please help me.
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Old 24th February 2012, 03:20 PM   #8
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Default May I modify by reduce i't voltage down to 1250 Volt.

So, may I modify by reduce i't voltage down to 1250 Volt or lower to use the 572B tubes? Or use other low voltage tubes? In the case use lower voltage, how can we modify the schematic?

Last edited by phamnguyenthethanh; 24th February 2012 at 03:26 PM.
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Old 24th February 2012, 03:55 PM   #9
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Wow... look at that tank coil and those tubes. I am no pro at this, but this thing was designed for pretty much one single purpose and that is to power signals over the air. This is not an audio amp.

To make it into an audio amp? Well, you might be able to use the enclosure and maybe the on/off switch and that is about it. And the knobs.

If you want to make an audio amp like a simple SE tube amp (okay forum members, don't bite my head off -- I am going real basic), then here is a list of what you need to start: for stereo, you'll need two output transformers, one power transformer, a couple of output tubes (triodes or pentodes), one gain tube, bases for the tubes, various electrolytic caps, wire, someresistors, and either a silicon or tube rectifier.

Or you could sell it for $300 and use that money and build a nice sounding low parts count chipamp instead.
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Old 24th February 2012, 05:25 PM   #10
kevinkr is offline kevinkr  United States
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There are plenty of tube guys in Vietnam to help you, this RF linear amplifier is not a suitable device to build an audio amplifier out of. Sell it on eBay and build something safe and suitable for audio. It's worth good money, people actually collect these, and selling it will get you more than enough money to build something suitable.
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