NAD (new to me): 1980 Marshall JMP 2104 50W (2204 combo)

[2dor]

Finally got the thing recap-ed today.

The Daly ones measured good (tech had them tested again) but I feel safer with the new F&T ones in there now.

Just need to take some time later in the day to retube & bias.

Can't wait to crank this one.

 

[2dor]

So the recap job alone took the B+ reading from 375-380 VDC to 408-410 VDC with the same tubes in the amp.. hot damn..

 

[MirrorProfiles]

So the recap job alone took the B+ reading from 375-380 VDC to 408-410 VDC with the same tubes in the amp.. hot damn..

Do you know what voltages you have going into the phase inverter?

 

[2dor]

Do you know what voltages you have going into the phase inverter?

Haven't measured it yet since I had to put everything back together again for the day but I might since I plan to roll a few tubes through the amp.

 

[2dor]

@MirrorProfiles you planted that seed in my head lol

I fitted my EHX EL34 pair back in (had a JJ E34L) the amp and rebiased the amp.

218 ~ 219 V measured on Pin1 of V3; B+ reading with the EHX EL34 in is about 391 VDC with the bias current at 40 mA. The earlier B+ reading was with the bias pretty low (27 mA), before I got to fiddling around with it to get it to a higher dissipation.

 

[EOengineer]

Recap was a solid move, especially with the F&Ts.

 

[2dor]

Recap was a solid move, especially with the F&Ts.

In this case, it was definitely a solid move.

 

[newholland]

even though im super psyched for you to rock this thing as a head.. i LOVE that combo so much.

 

[Humbug]

So the recap job alone took the B+ reading from 375-380 VDC to 408-410 VDC with the same tubes in the amp.. hot damn..

When in doubt... ;-)