Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Bluemule34 on April 11, 2018, 11:34:10 am

Title: Tweed output transformer
Post by: Bluemule34 on April 11, 2018, 11:34:10 am

Hello all. Anyone know what steel was used in Tweed outputs? What is the purpose of interleaved winding? Thanks!

Title: Re: Tweed output transformer
Post by: shooter on April 11, 2018, 01:17:53 pm

Quote

Tweed outputs

tweed can mean so many things these days  :icon_biggrin:

are you talking original 5W 6V6?
need some more to go on
IN SE, you typically don't want the OT to saturate early, but in a tweed, that's exactly what helps give it it's personality.
I Used Dougs reverb driver tranny for mine, well liked, single 6V6 PA tube

Title: Re: Tweed output transformer
Post by: Bluemule34 on April 11, 2018, 04:24:34 pm

Thanks for the reply. Never built a SE amp before. Played a Bivalve for awhile. Never should have sold that one.

Mainly looking for info on the Narrow Panel Pro and Bandmaster OTs. Would like to order a custom OT. Found the Classictone but its rated for 40 watts and would like 4/8/16 secondaries.

Title: Re: Tweed output transformer
Post by: labb on April 11, 2018, 05:44:46 pm

You way off course for a Classictone Champ type OT...Look at 40-18110. Don't know what you are looking at that is 40 Watt. Maybe a Baseman or one of the Deluxe...They are all PP not single ended.

Title: Re: Tweed output transformer
Post by: pdf64 on April 12, 2018, 06:37:58 am

At high frequencies, interleaving improves coupling between primary and secondary, and so frequency, phase and amplitude linearity.
As a general guideline, the Fender OTs with 2 mounting holes tend to be non-interleaved, whereas those with 4 mounting holes tend to be interleaved.
My understanding is that cheaper 'student' Fender amps would have lower spec OTs than their more expensive 'pro' amps. Hence the magnetic materials and winding arrangement would differ across the range.

Title: Re: Tweed output transformer
Post by: PRR on April 12, 2018, 11:32:08 pm

> what steel was used in Tweed outputs?

Power transformer iron from the 1950s.

As POWER transformer stuff, today's iron is "better" (lower loss) than the old stuff.

I am sure it makes no large difference for "sound". The large differences will be speakers (even if you found a new in box speaker from 1959, it would not be NEW anymore).