Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Big chief on June 28, 2020, 07:48:58 am

Title: Transformer for Supra model 24
Post by: Big chief on June 28, 2020, 07:48:58 am

Does anyone know what transformers are used on the Supro model 24
And where to purchase them
Thanks

Title: Re: Transformer for Supra model 24
Post by: shooter on June 28, 2020, 08:56:01 am

a schematic might help to count tubes n figure current and get idea on voltage.

Title: Re: Transformer for Supra model 24
Post by: sluckey on June 28, 2020, 09:24:38 am

I used a Hammond AO-24158-0 OT and a Hammond AO-24157-1 PT on my S-6424. Got 'em from eBay.

Title: Re: Transformer for Supra model 24
Post by: vampwizzard on June 28, 2020, 09:29:18 am

Was just gonna say Sluckey built one and documented it. His copy of the original schematic is cleaner than the other ones floating around the internet.

http://sluckeyamps.com/supro/supro.pdf (http://sluckeyamps.com/supro/supro.pdf)

Title: Re: Transformer for Supra model 24
Post by: Big chief on June 28, 2020, 10:49:20 am

Many thanks for the info

Title: Re: Transformer for Supra model 24
Post by: SILVERGUN on June 28, 2020, 10:50:30 am

http://www.classictone.net/Valco-Style-Transformers.html

Title: Re: Transformer for Supra model 24
Post by: shooter on June 28, 2020, 02:13:41 pm

 :laugh:
does someone have the decoder ring that gets me from;

"model 24" to "S-6424" 
I know, I need to be a Musician to understand   :think1:

Title: Re: Transformer for Supra model 24
Post by: SnickSound on June 28, 2020, 02:39:17 pm

Quote from: Big chief on June 28, 2020, 07:48:58 am

Does anyone know what transformers are used on the Supro model 24
And where to purchase them
Thanks

I used a Hammond set meant for a Princeton Reverb for mine. Voltages were in line.
OT specs have changed along the years from what my research told me. The Hammond was 8.5K primary but apparently 7K is more correct.