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What's New

Musical Power Supplies, Inc.

Lake St Louis, MO 63367




New Products
MPS Ebay Store

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


In Stock Transformers are in the Musical Power Supplies EBay Store.  EMail us for custom part quotes or special orders.

Price List, PDF file

Current MPS Pricelist
Download PDF file
Adobe Acrobat document [115.1 KB]

In late 2019 the US Mfr of the OT20PP, OT10SE and standard PT's passed along a huge price increase (100%).  We are mitigating this by takingstandard versions of the OT's to MX.  The samples have been superb.  We'll carefully sample and approve other OT offerings from Mexico as the value is excellent and price to you very competitive. For PT's we're keeping the windings in US as before, but final assembling core & varnishing here in MO. 

Some last buy SALE(!) stock of imported PT190.2i (CN built) transformers (220/240Vac x 190-0-55-190V 120mA x 6.3v(3A) x 5/6.3v(2A)) are available until sold out.  Figure $30US EA.....or make an offer.

Most previous models can be built to order upon request.  We do custom impedances of many standard OT's almost every week.  HiFi or Radio versions too.  Try us.

If you need parts quickly, our EBay Store will give you access to most current inventory and shipping will generally be within 1 business day.

MPS Ebay Store


Requesting a direct Quote and PayPal Invoice

PayPal Site

Ordering by EBay is convenient, but if you need a more precise quote or are ordering several parts it can be simpler to contact us directly by E-Mail.  We can send a direct invoice to your PayPal address and offer quantity discounts.  Often the best shipping rates and lowest total costs are obtained this way.

Custom Product orders will always be worked out by E-Mail.

To Order by E-Mail send an email to detailing:

  • Products you need by Part and Quantity
  • A Zip Code or Postal Code/Country to ship to
  • Your PayPal E-Mail address
  • Pricelist and Standard Discounts are below in PDF file

We will typically respond within 24hours.  Stock Items normally ship within a day of receipt of payment.

For Custom Products please provide some details of what you are looking for including:

  • Circuit & Tubes you are looking to use
  • Input & Output Voltages for Power Transformers
  • B+ Vdc and load (mAdc) you are expecting fromPower Transformers
  • Whether you will use diode bridge or tube rectifier (details)
  • any voltages & center-taps you need for your PT heater circuits
  • OutPut Transformer Impedances for Input and Output
  • Any special mounting, powder coating or other requirements


Shipping Estimates USPS Site

SHIPPING:  Reflects 2018 USPS Price Increases  (2018 increases apply 1/22/18)
Domestic US shipment is by USPS Priority Flat Rate.
1-2 pcs ~$8 total by Flat Rate Priority
3-6 Pcs  ~$15 total by Medium Flat Rate Priority Box
7+ Pcs  contact for accurate cost

Canada shipment is by USPS Priority Flat Rate

Up to 4 Lbs ~$25 Flate Rate Priority Padded Envelope
4 to 20 Lbs ~$48 Medium Flat Rate Priority Box
(small OT2PP or OT5PP can go 1st class mail  ~$16)

20+ Lbs  contact for accurate cost

Worldwide shipment is by USPS Priority Flat Rate
Up to 4 Lbs Approx $40USD
4 to 20 Lbs Approx $75USD
20+ Lbs  contact for accurate cost
USPS 1st class mail can be under $28USD for most small OT's - varies by destination.

International Shipping Notes-  from

  • USPS Priority Mail is typically a 6-10 business day shipping route with some limited tracking.
  • Priority Padded envelope tracking just indicates data entry.  A proper shipping box is used inside the padded envelope
  • A phone number for Customs Contact is recommended on the Int'l shipment