Power amps

jeremyb · Post by **jeremyb** » Sat Sep 10, 2011 12:54 am

Hi all, I've got a modeling effects unit (POD HD500) and was wondering about building an EL34 power amp for it, thinking 2x 50W so I could run it in stereo or bridge for 100W, anyone seen any similar projects or thoughts on how I could go about doing this?

Reeltarded · Post by **Reeltarded** » Sat Sep 10, 2011 1:00 am

There are schematics around the web for making stereo power. Do you have to build it? You can buy a used Marshall for less money than the transformers, and tubes.

It's just a power section from the PI back, x2.

jeremyb · Post by **jeremyb** » Sat Sep 10, 2011 1:34 am

Reeltarded wrote:There are schematics around the web for making stereo power. Do you have to build it? You can buy a used Marshall for less money than the transformers, and tubes.

It's just a power section from the PI back, x2.

Here in New Zealand the price of tube power amps is pretty crazy, building will be substantially cheaper

jeremyb · Post by **jeremyb** » Sat Sep 10, 2011 1:40 am

Hmmmmm http://www.torresengineering.com/do30to200waa.html

dreric · Post by **dreric** » Sat Sep 10, 2011 5:48 am

jeremyb wrote:Hmmmmm http://www.torresengineering.com/do30to200waa.html

I'd do a search of the database on Torres before you spend $4.95.

Torres tends to rework other peoples stuff in a super-cool-absolutelty-the-best-no-where-else-on-the-planet way, which does not always sit well with the reader.

Eric

M Fowler · Post by **M Fowler** » Sat Sep 10, 2011 12:39 pm

Torres schematics leave more to imagination then reference.

Dan has a weird way of doing his schematics too, all cramped together. Also, he leaves off the PT/OT information and when asked he replies no tech support can be given.

Waste of $4.95

Post the schematic and see what I mean.

Reeltarded · Post by **Reeltarded** » Sat Sep 10, 2011 1:13 pm

Ahh of course.

I don't have any great ideas, but I know schematics of the Marshall stereo amps are out on the web. You just take 2 separately fused 50s or 100s from the PI back, or build a pair of heads with typical series loops.

I would have to look.. I don't think it'd really be cheaper, would it?

mick · Post by **mick** » Sat Sep 10, 2011 4:56 pm

This is only mono but it's just a power amp with EL34's

http://www.ax84.com/static/corepoweramp ... ematic.pdf

Mick

Andy Le Blanc · Post by **Andy Le Blanc** » Sat Sep 10, 2011 5:28 pm

use two 50w opt and a 100w pt, shared power supply
but it keeps thing simple, is it just for guitar or are you looking for some fidelity too?

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