#0183 Power Trafo

[grtamp]

Hi all , can be ok one of this PT for #0183 Dumble clone with EL34?

1) Twin/Bassman 013692 (135W version)
2) Tonemaster 026554

or is sufficient the 125P34AX 022756 ?

Thanks

[67plexi]

Grtamp, The power transformers you have listed are 5.5 amps max. For the filament windings
You need 7 amps for the filaments on #183.
This is a Heyboer Blackface Twin plus HTS-10359. Jason had custom wound.
The original power transformer was a magic parts, TF-130

[Structo]

Massive!

[dreric]

This brings up a question that I have never gotten a clear answer to.

Please forgive me for not getting my RCA manual out to be specific on the math. That said, I understand that the power requirements of a 4 EL 34 amp are different that a 4 6L6.

There seem to be a fair amount of Dumbles with EL34 power sections, (183, 204 come to mind) that use the Magic Parts TF-130. Are there examples that used non twin PTs?

I've talked with Magic Parts and the designation TF-130 is their internal part number for the twin PT. Is has always been this way.

Therefore, HAD used a PT that was underrated in his EL34 builds. Does anyone have info that contradicts this?

Eric

[grtamp]

Hi 67plexi , the Heyboer Blackface Twin plus HTS-10359 have 230V tap also?

[johan]

Related subject -
Would it be possible to mod a DLite to a 50W #183?

PT - Stock DLite Export transformer
Power Transformers Specs: 100v, 120v, 200v, 220v, 230v/240v Primary
325 V secondary taps @300 mA, center tapped (325v-0-50v-325v)
6.3V center tapped @ 7A (3.15v-0-3.15v)
5V & 6.3V @ 3 A (5v-6.3v-0)
50V bias tap
center-tapped heater winding and hum shield.

OT - Marshall Plexi 50W, 2xEL34
http://www.tubeampdoctor.com/product_in ... cts_id=165

Choke 4H - 100 Ohm

[67plexi]

The JTM 100 Marshall power transformer 1203-80 would be my first choice
It has an input voltage of 100v, 120v, 220v, 230,240v

http://marstran.com/InStock.htm

http://marstran.com/Wiring%20Diagrams.htm

I hope this helps. Steve.

[johan]

Thanks!

...but for a 50W version of the #183. Will a 50W Plexi OT like the one above work? Made for 2xEL34

[67plexi]

Johan, The JTM 50 output transformer 789-139 will work out fine
for a 50 watt EL-34 amp.

[grtamp]

67plexi , excuse me , have you a wiring diagram of Heyboer you mentioned?
has 230V tap?

[ToneMerc]

The JTM 100 Marshall power transformer 1203-80 would be my first choice
It has an input voltage of 100v, 120v, 220v, 230,240v

http://marstran.com/InStock.htm

http://marstran.com/Wiring%20Diagrams.htm

I hope this helps. Steve.

Steve, unless he going to use a voltage doubler circuit I would shy away from the 1203-80. That PT was designed as a replacement for the 67' JTM100 dual bridge rectifier, 8 "inside" can model. Besides these suckers are heavy, 16 lbs of iron, 5 more than you really need.

A better choice would be the 1204-43 (JTM66 45/100), using the 490V tap.

Wiring the 1203-80 secondaries............

TM

[ToneMerc]

67plexi , excuse me , have you a wiring diagram of Heyboer you mentioned?
has 230V tap?

It does not have export taps.

TM

[grtamp]

It does not have export taps.

It's a shame

[MARK1]

Hello all,

I have been reading here over and over again, but I am still not sure if we can use the Tonemaster 026554 PT, I think it is also used in the red knob twin. I have an export version I can rebuild to 102 or 183, because I am from europe. Can some one say for sure it is save to use with EL34. Although I have to say, when the twin was still working right, I have tried EL34 in it for some time and have had no problem yet.

André

[Structo]

First, do you want to build a 100 watt version?

As mentioned, you should use a PT with 7 amperes capacity on the 6.3 vac filament winding.

For 50 watt amp you should use 6 ampere.