Doubling the power of hifi tube amplifiers

[slafferty]

Announcing a new article on Tronola.com: The amazing Supermods™ technique can double the output power of almost any push-pull, fixed-bias, hi-fi, tube amplifier! (Assuming it has room for more tubes.) "Hotrodding the Eico ST-70" produces 71-watts per channel from the original output and power transformers of this classic amp. It astonishes experts with excellent 20Hz performance.

This technique was pioneered by one of the diyAudio forum members and was mentioned in an earlier thread here. The article offers in-depth coverage of the technology, including analyses of how and why it works, along with verifications of the results.

See it at: http://www.tronola.com (The top story.)

Steve L.
Tronola.com

[aardvarkash10]

sales pitch (and neither a good nor convincing one...).

Appropriately enough, when I clicked the link my company's web protection declined to follow, stating the site was "Games".

[DigitalJunkie]

I kinda sorta recall a thread about this...and it seemed like a good way to burn up the power transformer.

[pchw]

Originally Posted by aardvarkash10

sales pitch (and neither a good nor convincing one...).

Appropriately enough, when I clicked the link my company's web protection declined to follow, stating the site was "Games".

You reminded me my company's lame spam filter.

One of our clients sent us a file to consult an error. The company's spam filter (at the server level) blocked off the email (due to the attachment), and no one knew that because the email didn't appear in the "personal" spam folder at all. A few day later, the client's VP escalated to our VP to complain that we didn't respond to customer's urgent matter.

Sometimes false alarm can be quite damaging:-)

[slafferty]

To: aardvarkash10

Sales pitch? Tronola is a non-commercial site and neither the article nor the site has anything for sale. A number of people worked hard to bring this surprising development to light, simply because they think it is interesting and important.

You and your company's spam filter were made for each other :-D

(Sorry, I couldn't resist. Gotta grow up

Steve Lafferty

[bear]

Nothing much wrong with what I saw there.

Assuming the power transformer can deliver the juice then it will work as advertised.
He's merely adding another pair of output tubes, so it is push-pull parallel.

Also changing the circuit a bit and the feedback.

That is questionable in terms of the subjective sound, but it might be ok or better than stock.

It might be a good idea sonically speaking to strap the output toobes for triode, you lose a bit of power but gain a bit in sonics... at least usually.

_-_-bear

[dgta]

Nothing wrong with that site, nor with the PPP idea, if the OPT can take it.

[astouffer]

Such an amazing technique, adding double the tubes makes double the power!

[a.wayne]

[Loren42]

Or, a cheaper way to do it is to move closer to your speakers by half.