I recently aquired a 1952 Gibsonette amp which does not have much volume. It runs on two 6v6 gt tubes that look like they are parallel, but might be push pull. pins 1,2,4,7, and 8 are wired to each other. There is a small Hammond choke white wire to pin 4 6v6's, black wire to pin 8 rectifier. There is a Hoffman transformer 1030, on the input side white to pin 3 6v6, black to pin 3 other 6v6, black w/white stripe to pin 4 6v6's; on output side black to (-) side speaker, yellow (8ohms) to (+) side speaker. Speaker is a newer type Fender brown label from a Pro Junior. Have a strat volume dimed, w/stock pups plugged into input 1 or input 2, when the amp is on and volume at max, it takes about 10 minutes of warm up before any output, and it is very low volume although nicely distorted. The schematic shows a 5y3 Rectifier, but there is a 5au4 in the socket. I know how to use my DMM, but I do not know much about Tube amp wiring. Another observation regarding the 6v6's; one is a Raytheon JAN type, other is a RCA and the entire glass all the way around and between the top and bottom plates has a dark blue/greyish fog. Both 6v6 illuminate dimmly (looks normal to me) when on. The rectifier is brighter. There are three new looking orange caps wired in to the input jacks, volume and preamp tube and one 6v6. One the other side there are two new grey caps wired together and in between pin 4 6v6 and rectifier pin 8. I'd greatly appreciate comments and suggestions concerning the volume issue with this amp.
Ad Widget
Collapse
Announcement
Collapse
No announcement yet.
Gibsonette low volume-- Need help
Collapse
X
-
The 6V6's are in parallel. It shouldn't take 10 minutes to warm up as you have stated; I think it might be a good place to start with known good tubes first. Check the plates of the 6V6's. They should be connected to the OT, and measure ~320V. The preamp tube should have ~160V on the plates. It sounds like someone may have gotten this thing going by replacing a few caps and replacing the OT, but if you have not heard it running before, you hay have inherited someone elses problem. Measure a few voltages, try some new (correct) tubes, and then come back here.Black sheep, black sheep, you got some wool?
Ya, I do man. My back is full.
Comment