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Musical Power Supplies, Inc.

Columbia TN, 38401

 

Email: questions@musicalpowersupplies.com

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MPS Ebay Store

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

MPS New Projects

Updates 25-JUN-2022-

WARNING-  An EBay customer has found a seemingly fake store ("Shoptokeluv.site" also identifed as "Boria") that shows duplicate MPS & most other EBay Vintage Electronics listings.  It reports 1/2 price and "1000" in stock.  If I sold them every OT10SE we ever built it might be 1000pcs....... but don't expect to receive any parts.  If it's too good to be true it generally is.  Be careful sourcing parts....

UPDATES-  OT5PP, OT8SE, OT12PP+ MIM are back in stock as of MAY.   
PT's are currently pretty much make to order in TN.  The US supplier we bought the windings from stopped taking our work. Suppy Chain disrupted!

We are feeling lots of cost pressure on inbound Freight and parts like everyone.  The price of transformer stampings has doubled & lams are up 30%.  So as we use up stock we're going to need to adjust pricing to help cover.  There'll be a new pricelist in the next month or so.  Hopefully the rest of the items you all need for your projects are all obtainable.  Lots of stores seem to be out of stock on many amp parts.

We've been working out of one small corner of our future shop since our September move to TN last year.  It looks like we'll be back to full speed in August as construction should be done within a month.  Hope to be able to do a bit more to increase capacity, broaden offeriungs and stock HiFi and PT parts soon.  

PT350M-TWD-USA Tweed Power Xfmr 700Vct(130mA) 6.3Vct(3A) and 5V(2A) heaters.

 

OT8SE STD- 5K/7K ohm 4,8,16 ohm 4-8VA (50mADC) Mexico built shielded Single Output Transformer     <<Coming late JUL 2020>>
Samples approved in June for a production run this Summer.
This is a small economical Single Ended project transformer using the EI-3/4 29M6 Laminations in a 3/4 in square stack.  Think EL84 and 6V6 on a budget with three outputs.  Last ran this version in Asia.

 

OT5PP STD- 22K5 ohm 4,8,16 ohm 1-5VA Mexico built shielded Push Pull Output Transformer     <<Coming AUG 2020>>
Samples approved in June for a production run this Summer.
This is a Low Power project transformer with full range sound using the EI-3/4 29M6 Laminations in a 3/4 in square stack.  Same design we've offered since 2010.  Looking to keep this in EBay Store stock regulary.

 

OT12PP+ STD- 10K/8K ohm 4,8,16 ohm 12 - 18VA Mexico built shielded Push Pull Output Transformer     <<Coming AUG 2020>>
Samples approved in June for a production run this Summer.
This is a "Tweed" or Vintage project transformer using the EI-3/4 29M6 Laminations in an oversized 1in thick stack.

 

OT19PP-DYN-USA- 8K:4,8 ohm USA built OT Dynaco35 HiFi amplifier Kits-  EI-1 size 22VA version

OT22PP-DYN-USA- 8K:4,8 ohm USA built OT Dynaco35 HiFi amplifier Kits-  EI-1-1/8 size 30VA version

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

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 

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

 

Other Projects 

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).  

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.