Making a PP OT out of 2 SE OT

[Baguette]

Hello,

So I've got a slew of little 5W Champ style OTs and would like to use two of them to make a PP OT for a Tweed Deluxe type amp.
The SE transformers are 5K to 8ohm.
- Would it give satisfactory results?
- How should I wire the two of them together? (an equivalent 10K to 8ohm PP transformer would be fine).

Thanks for the answers and all the very best.

[shooter]

search this forum, there's some good threads on the pros n cons.

[kagliostro]

It may work, but isn't the best

in a PP amp there is cancellation of noise because of the two opposite signals

using 2 x SE OT as to recreate a virtual PP OT didn't cancel noise

I've the example of an old Corland, italian guitar amp that a friend restored






He tried a single PP OT and was happy to leave it in the amp

K

[Baguette]

Hello,

I did a search and came up with nothing.
Do you have some useful links?

Thanks for the schemo. So the prims are in series and the secs are paralleled.
How should I do with mine to achieve the desired 10k to 8ohm ratio?

Thanks!

[jeff]

The primaries aren't really in series.
 
The primary of one goes from B+ to one tube's plate, while the primary of the other goes from B+ to the other tube's plate.

Each tube is connected to it's own transformer and the outputs of both transformers are in parallel. So it's like you have a "push" transformer and a "pull" transformer. One tube/transformer is handling mostly the positive part of the signal and the other tube/transformer is handling mostly the negative and you're combining both outputs for the full (push pull) signal to the speaker(assuming it's biased class AB)

[jazbo8]

I think the calculation was shown in one of kagliostro's threads, it is also a bad idea to use two perfectly good SE OPT's for a PP amp. I would save them for other SE projects, and buy yourself a proper PP...