Replacement Transformers for HD-150
Hello all,
I purchased from a backline company (at a very low price) 2 MusicMan chassis that are missing the transformers .
An HD-150 - Reverb, and a HD-150. The Reverb is a full amp with cab and speakers, the 150 just the chassis. (I've attached pics of the serial plates)
Appears that the repair department at the backline company used these as donors to repair other amps.
So I’m looking for replacements for both the Power transformers and the Output transformers.
I've repaired and restored a number of MusicMan amps but not an HD-150 and currently don't have a HD-150 to do any measuring or reference and wanted to see if anyone could assist.
I know that Tube Amp Doctor is supposed to have a replacement PT But I checked their site and i couldn't find one.
Mercury Magnetics have 130-HD PTs (including a v2 model) and OT's but no 150's and they are pricey and not sure they will work with the 150's.
I’m working with the engineers at Pacific Transformers in Anaheim to possibly have them build some replacements, but I need to find the transformer part numbers and also the specs they've asked for these transformers:
Input voltage
Output voltages
Total power
Operating frequency
Wire color code
Some of the specs I can get from the schematics, but not all.
The PT should probably be specked to the replacement transformer from Service bulletin 3 as both these amps have the High/Stby/Lo switch on them.
Any help you can provide?
I think Pacific Transformer could be a good affordable source for these and other MusicMan model PT's. I had them do an OT for a Fender Dual Showman and it worked great. They sell a number of trannies on Reverb as well.
Thanks,
Micajah
Mid Century Audio
Member for
10 years 7 months
Member for
10 years 4 months
Thanks for the response. I…
Thanks for the response. I've serviced quite a few of these so I'm not concerned about the wiring. I'm just calculating that if I spend the $ on Mercury Magnetics I'll have almost $600.00 in transformers alone and then I've got to go through the rest of the amp... Is it worth the investment? Pacific Transformers make a great product for much less. Was trying to establish a new vendor for these transformers for the whole line of MusicMan amps.
Member for
10 years 7 months
Much as I love the amps, I…
Much as I love the amps, I DO question the practical side of the money output. Yes, the amps are worth $1000 but counting labor time and cost, I don't see the upside unless you just WANT to do it. If you only needed one transformer, OK. I can see that but both hunks of iron are too much of an investment for the return. Better off selling the parts as original and see if you get any bites.
Wish I could help but I've…
Wish I could help but I've worked on exactly ONE 150 and didn't take any notes. I DO have a series of pics that I took of the inside but I don't think THAT will help. The wiring bundle coming out of the PT is shown but that won't really help you. Sorry I don't have any more info than that.