Music Man Transormfers

[fenderbender4]

I saw some older threads talking about music man transformers used in amps and was wondering if there were specific models of MM amps that had the right transformers? I know of the RD, RP, and HD series of pa but don't know which transformers were used in the dumbles. Are they different? Or did MM just use the same transformers in multiple models?

I tried searching but didn't see anything specific other than they can be used with some lowering of the voltage.

Thanks!

[ToneMerc]

I saw some older threads talking about music man transformers used in amps and was wondering if there were specific models of MM amps that had the right transformers? I know of the RD, RP, and HD series of pa but don't know which transformers were used in the dumbles. Are they different? Or did MM just use the same transformers in multiple models?

I tried searching but didn't see anything specific other than they can be used with some lowering of the voltage.

Thanks!

Yes, they are different. Pertaining to Dumbles, the HD130 makes a great 4 output tube donor iron platform, see the 2475-130 schematic. Lowering the voltage kind of defeats the MM topology, my clones run 710-715V or so on the plates.

200-130 power

4-130 OT

TM

[ic-racer]

Thanks for the info. Are you using an original transformer or a replacement?

I found these specs for a Schumacher replacement but am still looking for the actual transformer.

Music Man 130 (model 2275 4-10)
High Voltage Sec #1 Sil Voltage Doubler (F.W.) (2) 100mfd
Brn - R/Y 710vdc @ .100a 660vdc @ .275a
Red- R/Y 440vdc @.275a

Low Voltage Sec #2 org - yel- org
Sil. Bridge (2) 150 mfd cap + - 42 V 0A 60V CT @ .1 RMS

Filaments (2) 6.3V @ 6 A grn- grn/yel

[ToneMerc]

Thanks for the info. Are you using an original transformer or a replacement?

I found these specs for a Schumacher replacement but am still looking for the actual transformer.

Music Man 130 (model 2275 4-10)
High Voltage Sec #1 Sil Voltage Doubler (F.W.) (2) 100mfd
Brn - R/Y 710vdc @ .100a 660vdc @ .275a
Red- R/Y 440vdc @.275a

Low Voltage Sec #2 org - yel- org
Sil. Bridge (2) 150 mfd cap + - 42 V 0A 60V CT @ .1 RMS

Filaments (2) 6.3V @ 6 A grn- grn/yel

That Schumacher is the wrong MM PT for the 130W model, see my post above. The link you posted to the TAD HD 130 model was the correct design/layout. However, it's a tad hot at 285V. That TAD model would be about 804V unloaded and around 765V-plates/383V-screens loaded, whereas the MM was 265-0.

If you wanted to clone the stock H/Lo power setup,then the HT secondary winding would be laid out as follows; 265,180-0

First HV build was a stock replacement because I talked myself out of my own design, all others my own design.

TM

[ToneMerc]

Thanks for the info. Are you using an original transformer or a replacement?

I found these specs for a Schumacher replacement but am still looking for the actual transformer.

It can be confusing because some model numbers appear to be the same amp, but they are not and then there's the Type 1 and Type 2 series power transformer designs. The TAD ad is almost misleading, even though it is a replacement for the Hi/Lo Type 1 amp, that PT has only a high tap secondary.

TM

[ic-racer]

Tone Merc, thanks for your help I was forgetting about a 1.4 conversion factor for the resulting DC voltages.

I'm hijacking this thread a little but I'm looking at my notes for a possible "RIPPER" build and see reference to 700V Music Man iron. Any thoughts or suggestions on that.

[amps-n-bits]

Hi I'm new to this site and was looking for some info and came across the Musicman Transformer thread and thought this info below may be of use to someone one day? regarding the correct transformer number for the correct Model original Musicman circa 1970's/early 80's Valve/Tube amps

8-50. EIA-606-103 Output Transformer. Used to Replace all 50-watt (RD-50's)

7-50-250. EIA-606-114 POWER TRANS FOR ALL 50watt (RD-50's)

100-65-250. EIA-606-011 POWER TRANS FOR ALL 65 & 75watts HAVING THE "HI Stby LO" SWITCH ON FRONT PANEL

2-130-A' EIA-606-701 POWER TRANS FOR ALL 130watts ONLY. HAVING THE "HI Off LO" SWITCH ON FRONT PANEL

200-130. EIA-606-437 POWER TRANS FOR ALL 130 & 150watts HAVING THE "HI Stby LO" SWITCH ON FRONT PANEL

Hope this is of some help I have the full list somewhere I will update when I find it .