Q7 is part of the tremolo circuit. It's a small signal JFET. Hard to tell cross references. Just buy the next common JFET you can get (BF245 J111 and the like), and if you aren't satisfied with the outcome (chopped, helicopter like sound maybe), get another one and try.
Best regards!
Best regards!
Maybe this is usefull (see fourth picture): Alamo Montclair Reverb model 2565 '76 | Bluedart Music | Reverb
So the only FET in the amp in the link is (or at least could be) a TIS58 but maybe the circuit changed over time...
So the only FET in the amp in the link is (or at least could be) a TIS58 but maybe the circuit changed over time...
Good eye 🙂
Basically "any" N Channel Fet will do , like kaipirinha said.
TIS58 was an early FET, VERY inconsistent, parameters could vary as much as 5:1 (500%) so if an unspecified TIS 58 works there, "any" N Channel Fet will do.
Very crude circuit, no adjustable (or any) biasing, Fet is fed the wrong polarity signal voltage half of the time so a diode was added to chop that, the works.
Which for you is good 😉
Basically "any" N Channel Fet will do , like kaipirinha said.
TIS58 was an early FET, VERY inconsistent, parameters could vary as much as 5:1 (500%) so if an unspecified TIS 58 works there, "any" N Channel Fet will do.
Very crude circuit, no adjustable (or any) biasing, Fet is fed the wrong polarity signal voltage half of the time so a diode was added to chop that, the works.
Which for you is good 😉
^^^^^^ this is for PCL200 who found the tube list.
The rest of my answer:
is for RJohns777 and means the mystery transistor is EASY to replace.
When a thread answer is posted, in principle it´s addressed to the OP.
