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Musical Power Supplies, Inc.

Lake St Louis, MO 63367

 

 

Email: matt@musicalpowersupplies.com

New Products
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To check out our newest projects , click here for New Stuff.

MPS New Projects

New OT43PP_DYN70-  Created a version of the"OT42PP"  using an EI1.0 x 1.25IN bobbin for a Dynaco 70 request.  Wound it in 5 sections.  The inductance came in nicely with the extra iron and it will do a full 20Hz ro 20KHz range based upon the OCL and SCL measures.

OT5PP-8 (USA)- EI75 -  TI've been doing a few basic 8ohm only versions of the OT5PP, OT2PP and OT3PP to offer a low cost project OT for those that don't plan on running external cabinets.

Note on current USA Production The US Supplier I've been using since 2013 was acquired by another company and has judged my parts too expensive to run and doubled their price to me of the finished parts.  They continue to wind PT275.2 for me (we'll laminate here) but I'm busy sourcing the higher volume parts elsewhere.  OT10SE and OT20PP are at the top of the list.  If you see occasional non-stock situations in the EBay store.... we're building here in MO to cover it while we get another qualified source on line.  

 

2016 Amp Build Project

It seems like I find time around the holidays each year to build myself an Amp.  This year I built a Classix Audio NSV6B kit with custom OT20PP (5K1:8ohm) and PT290.2  updated Traynor Bassmate 20 6v6 circuit .  My first PCB based kit.  Nice circuit with Basic Traynor Bass input plus a high gain for guitar.  It works OK as a bass practice amp & rocks nicely as a guitar amp.  Got the nice lows with the custom OT I whipped up for this build.  It's good to be the Xfmr guy ;-)
http://classixaudio.com/nsv6b.htm

 

OT43PP_DYN70 (USA)- 4K6:4,8 ohm USA built OT fuse in Dynaco 70 HiFi amplifier Kits

OT16PP (USA)- simple 6K6:8 ohm USA built OT for the economically minded Deluxe or 6V6 P-P combo builder

OT17PP (USA)- simple 8K:8 ohm USA built OT for the economically minded Tweed/Princeton/18W builder

OT12PP (USA)- Some builders are really liking this Tweed sized EI75 P-P OT.  It's got a 1" stack instead of 3/4" stock size trannies.  The inductance on this is up over 40H so the low end is there.  8K: 4/8/16ohms at 20W maximum

PT240.1 (USA)- I've had a nice little 2-section PT Bobbin hanging around for a while & have built a couple of filament transformers with it.  This month I finally got around to building a small HiV PT with it for 12AU7-ish circuits running at 1W to 5W.  It is the same size as the OT20PP USA in VC87 bells & on the bench I dropped it into my 20VA resistive load and it held up a 325Vdc B+ thru my diode bridge (using "120" inputs) and 340Vdc B+ putting 120 actual onto the "115" inputs.  I center-tapped the heater .... just because Hammond doesn't and I can.  I'm not yet seeing why I can't offer this somewhere around the OT20PP USA price level.

PT190.1 (USA)- a small HiV PT with it for 12AU7-ish circuits running at 1W to 5W.  It is the same size as the OT20PP USA in VC87 bells & on the bench I dropped it into my 20VA resistive load and it held up a 260Vdc B+ thru my diode bridge (using "120" inputs) and 285Vdc B+ putting 120 actual onto the "115" inputs.  I center-tapped the heater 

New Projects Incubating.......

OT5PP+ variants built this week for HiFi.  They turned out really nice with super nice inductance and low leakage inductance due to the 5 section winding interleave.  This is a nice little OT.  I can feel an "OT12PP" 12VA push pull OT coming out of this.

PT290.2i - smaller 220/240Vac mains int'l type Power Transformers just under 4Lbs shipping.  These will fit in the 4Lb USPS Int'l Flat Rate package and ship for a reasonable cost (~$26USD).  I can tweak the PT275.2i to operate anywhere from 190-0-190 (120MA)  to about 325-0-325 (80mA).  

USA built OT19PP, OT20SE and OT40PP can be provided in the FM-100 full mount covers
OT3SE in the EI-62 material set. It's an over-sized 3/4" stack with a gap.
OT18.2PP 8000Ohm :4/8/16 EI100 x 1.4in stack w/5 Layer winding interleave. 4 Lbs of sonic goodness. What do you have inside your amp????
OT18.2PP PLUS- EI112 x 1.7in stack. 5 Lbs of heavy goodness. 8000Ohm: 4/8/16 Ohms and 35VA.
PT290P USA Laydown Power Transformer