Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: octal on March 14, 2021, 08:54:27 pm

Title: Supplier for a transformer with about 190-0-190 @ 100mA or so?
Post by: octal on March 14, 2021, 08:54:27 pm: Arrgh! I'm trying to build a small amp with a B+ of about 270v and SS rectification. Hammond doesn't seem to have anything that will work (the best match has only 70ish mA rating) The pt190.2 from Musical Power Supplies would be perfect (380Vct/120mA), but he doesn't have any with 120v primaries in stock. Edcor has some close-enough options, but they are quoting 10week+ lead times.

Am I overlooking a supplier? I figured out a way to get what I need using a HV transformer + a doubler and a separate filament transformer, but that seems really inelegant. Thanks in advance!
Title: Re: Supplier for a transformer with about 190-0-190 @ 100mA or so?
Post by: thetragichero on March 14, 2021, 11:49:54 pm: what sort of filament current do you need? maybe not elegant, but i've been using toroidal power transformers purchased off ebay for about 30 bucks shipped, 216vac/120ma 12.6vac/800ma, wiring the power tube filaments (6v6gt) in series and the little bottles without the center tap. besides chinese writing on the side, it mentions record player so i'm guessing that's what they were originally for
Title: Re: Supplier for a transformer with about 190-0-190 @ 100mA or so?
Post by: DummyLoad on March 15, 2021, 01:11:52 am: https://www.edcorusa.com/xpwr257

https://www.antekinc.com/as-1t200-100va-200v-transformer/

--pete
Title: Re: Supplier for a transformer with about 190-0-190 @ 100mA or so?
Post by: octal on March 15, 2021, 07:28:54 am: Thanks for the replies, folks! For this project I don't want to go with toroidals for packaging reasons, but they would be a good alternative otherwise. I do need at least 2A on the filament winding. I'm still thinking about it- that 10+ week lead time Edcor is quoting nowadays is pretty unappealing but maybe they're the best bet.
Title: Re: Supplier for a transformer with about 190-0-190 @ 100mA or so?
Post by: Cree on April 20, 2021, 03:06:17 pm: https://www.musicalpowersupplies.com/. contact this guy he will build you one. Here is his part number, PT190.1_USA_VC87.