"Pre-500" transformers

[AdmiralB]

Why does the 'collective wisdom' state that they used Mark III parts?

I can see the OTs being non-simulclass parts (especially with the lack of a 16-ohm tap), but there's no way the power transformers are Mark III parts - no Mark series ever used a tube rectifier.

 

[Bullen]

Well, not all mark III´s were Simul Class amps. I´ve heard that they used the output transformer from the 100w version of the Mark III which was different from the Simul-Class one.

I don´t think that solid state or tube rectifiers makes a difference to the OT used. But i could be wrong about that.

 

[AdmiralB]

It makes a big difference with regard to the power transformers. Not only do the DRs require a 5V winding for the rectifier tubes, they require one with a 6A rating...which AFAICT was never before offered in ANY guitar amp.

 

[Boogiebabies]

Just the OT's. The PT's are usually dated two years ahead of the OT's, so the OT's are for the MK III. I called Boogie on the OT and the last use was on a MK III. Like the 561140, it too has a 5V tap and is in the MK IV.
Why the early DR PT's had a 5V tap is unknown. If I remember correctly, My OT is from 1990 and my PT is from 1992.

Corrected, now that I have my amp in front of me.

 

[AdmiralB]

You've got it backwards. The OTs are dated 1990, the PTs current with amp manufacture.

Why the early DR PT's had a 5V tap is unknown.

Unknown? Um, how would the DRs power their 5U4s without one?

I can say with almost complete confidence that no Mark III ever had a 5V tap. The PTs are designed for the DRs. The OTs might very well have been non-simulclass Mark pieces.

 

[Boogiebabies]

You've got it backwards. The OTs are dated 1990, the PTs current with amp manufacture.

Why the early DR PT's had a 5V tap is unknown.

Unknown? Um, how would the DRs power their 5U4s without one?

I can say with almost complete confidence that no Mark III ever had a 5V tap. The PTs are designed for the DRs. The OTs might very well have been non-simulclass Mark pieces.

Yes, you are correct. I did not have my amp sprawled out in front of me.

Dual Rectifiers get their 5V heater supply from a magic voltage fairy who lives in Petaluma you jerkoff, where else do you think it comes from.

 

[Boogiebabies]

Just the OT's. The PT's are usually dated two years ahead of the OT's, so the OT's are for the MK III. I called Boogie on the OT and the last use was on a MK III.

Why the early DR PT's had a 5V tap is unknown.

 

[AdmiralB]

you jerkoff

Ah, taking the high road. Always a good choice.

So, the question remains...why does everyone say the early DRs have Mark III power transformers?

 

[fireonhigh]

:idea: resale value?