50 and 100 boards

aside · Post by **aside** » Fri Jul 06, 2007 9:48 pm

hi, posted this in the marshall forum but no reply...

hi guys - ordered a 100watt PTP board for a superlead, and received a 50. what are the differences, they seem the same?
cheers

a response from anyone would be much appreciated!

Flames1950 · Post by **Flames1950** » Sat Jul 07, 2007 12:14 am

The only big difference between the two was how the rectifier diodes (and the wires to them) were laid out -- even though the turrets may be in the same places. Mounting holes match up OK?

aside · Post by **aside** » Sat Jul 07, 2007 2:36 am

not sure, amp is not with me atm. so all the actual components are the same?

Flames1950 · Post by **Flames1950** » Sat Jul 07, 2007 7:24 am

Yes, components are the same either way. Sometimes depending on how much high voltage the power tranny puts out you may delete one resistor from the 50, but that's about all.

aside · Post by **aside** » Sat Jul 07, 2007 7:33 am

awesome, thanks so much for your help.. rock on!

SDM · Post by **SDM** » Sun Jul 08, 2007 5:53 am

Don't forget the bias supply resistors. A 100 watter gets bias supply AC from a PT winding, a 50 watter typically from the high voltage taps, so a resistor or two varies there.