Tube Amp Archive

Has anyone else come across this problem? Sounds Like static or vibration on lower notes. I hear it as the note decays mainly on the clean channel. Any input would be appreciated. All the solder joints are good. The 10000uf cap was replaced. The rest test well. Jacks were repaired. Tubes are new. Sp...

The normal channel on the AB165 has an extra gain stage that I want to retain. It's not the same as the other variants. It has a local feedback resistor etc. In addition I want the same layout without the final gain stage as in the AA864 or AA165 normal channel. My question is how would I properly ...

Both channels are exactly the same until the 220k resistor but there is more to the ab165 channel. I want the whole AB165 normal channel all the way to the phase inverter. This would include the "mixer stage" or 3rd gain stage which is not part of the other circuits normal channel. I'm talking about...

The normal channel on the AB165 has an extra gain stage that I want to retain. It's not the same as the other variants. It has a local feedback resistor etc. In addition I want the same layout without the final gain stage as in the AA864 or AA165 normal channel. My question is how would I properly c...

I have an AB165 amp 1968. It's rebuilt stock. I tried the AA864 normal channel mod and liked it but I also like the AB165 normal channel. How can I combine these two amps? When I tried the AA864 normal on the otherwise stock Ab165 I got a lot of hiss whenever the volume was up on the bass channel. I...

I have an AB165 amp 1968. It's rebuilt stock. I tried the AA864 normal channel mod and liked it but I also like the AB165 normal channel. How can I combine these two amps? When I tried the AA864 normal on the otherwise stock Ab165 I got a lot of hiss whenever the volume was up on the bass channel. I...