Recent content by Manchu6

Funny. I have a 68 Ampeg B15N, mostly original. My go to guitar is a Fender American original 50s P Bass ( 2017 replica) White blonde with flatwounds.

La Bella 760FS Deep Talkin' Bass Flatwound Bass Guitar Strings - .045-.105 Standard Or Ernie Ball 2813 Hybrid Slinky Flatwound Electric Bass Guitar Strings - .045-.105

Thank u. Looks nice! I have a 68. Yours is prettier than mine. Mine has had a hard life, but is cleaning up nicely. Someone rattle can painted the top and sides, but failed to tape off the front face. It has couple dozen small, partially faded paint splotches on the face plate. I’ve...

Figured out bias issues. Running right around 43ma, JJ. 6L6Gc. Replaced the diode, resoldered a few questionable connections. Now I have a noisy volume pot, goes to nothing to loud pops, hum, then very weak volume. Sounds almost like touching the guitar input cable leads Used a bit of...

Thanks for both the info and the help.

Shouldn't I be getting readings in the upper 30s to low 40s? If so, then this thing is really under biased; correct? Power tubes are relatively new; pair of JJ and pair of Groove Tubes. R39 (1K, 10 W) was within spec. R36 (100K, 2 W) also was within tolerance (98K). C15 (100 V, 100 uF) is...

hooah. Keep up the Fire!

Both tubes about the same. Isn’t the correct bias around 42 ma? Does this mean I should replace diode and/or resistor? New tubes, new capacitors.

Re Manchu 6. Yes. Actually. Was officer in 1st Bn, 9Th In Regiment, Cp Greaves, Korea. 2ID. I’m a retired army officer.

Tried different multimeter. Now I’m getting this. Underbiased?

I'll check it out and give it another try. yeah' I've biased a couple of amps, but it has been awhile.

Hey I would like to join the club! Just picked up a1968 B15n. Just replaced the tubes and filter caps. Also checked all the resistors. Looks to have a CTS Speaker. Replaced the shock mounts, the latches and the cabinet gasket. Needs a new lid, which I have in order from Fliptops.net...