DanR
Member
- Messages
- 3,785
I just received a 1960 Ampeg Jet amp that I won off Ebay. Upon trying it out for the first time, I found that the output was quite lower than what I would expect. My '75 Vibro Champ is louder. On the other hand, the amp is quite quiet hum-wise.
Upon closer inspection, it appears that all the internal components are original, although it is difficult to tell whether the filter cap can has been replaced. Apparently, it is doing it's job as I've mentioned it's pretty hum-free. The tubes are pretty old, also. They are old American tubes and the power tubes (6V6) are a mixed pair consisting of one Westinghouse and one Motorola. Also, the phase inverter tube is a 6SN7 as opposed to the specified 6SL7. The internal resistance of these tubes is considerably different. I looked the specs up last night.
Anyhow, I'm wondering if the lack of power is due to old tubes or if the fact that the wrong PI tube is used is the cause. Also, should I automatically have all of the electrolytic caps changed? Are there any other components I should consider replacing?
DanR
Upon closer inspection, it appears that all the internal components are original, although it is difficult to tell whether the filter cap can has been replaced. Apparently, it is doing it's job as I've mentioned it's pretty hum-free. The tubes are pretty old, also. They are old American tubes and the power tubes (6V6) are a mixed pair consisting of one Westinghouse and one Motorola. Also, the phase inverter tube is a 6SN7 as opposed to the specified 6SL7. The internal resistance of these tubes is considerably different. I looked the specs up last night.
Anyhow, I'm wondering if the lack of power is due to old tubes or if the fact that the wrong PI tube is used is the cause. Also, should I automatically have all of the electrolytic caps changed? Are there any other components I should consider replacing?
DanR