Tweet
This 2 channel with tremolo amp has intermittent output.
This amp has two chassis. Preamp on top and power amp on bottom. There is an octal plug that connects them. They are grounded to each other via the shield of the RCA signal feed cable.
This amp had been serviced recently then purchased on Reverb.
I cannot find a schematic for this model so I am using a Centurion 275 schematic attached, focusing on the output tubes.
Sometimes if I chopstick around the output tubes pins 4 and 5, I can make it come and go.
Tubes test good, Sockets cleaned and pin sockets tightened. Wobbling tubes does not change anything.
What I find odd is that the output tube grid pin 5 is not directly connected to the .01 coupling caps, there is a 390K resistor in between. See last image below that I drew.
Hoping to find a proper schematic and opinions on the issue and wiring.
Thank you, Mark
Danelectro_centurian_275.pdf
This amp has two chassis. Preamp on top and power amp on bottom. There is an octal plug that connects them. They are grounded to each other via the shield of the RCA signal feed cable.
This amp had been serviced recently then purchased on Reverb.
I cannot find a schematic for this model so I am using a Centurion 275 schematic attached, focusing on the output tubes.
Sometimes if I chopstick around the output tubes pins 4 and 5, I can make it come and go.
Tubes test good, Sockets cleaned and pin sockets tightened. Wobbling tubes does not change anything.
What I find odd is that the output tube grid pin 5 is not directly connected to the .01 coupling caps, there is a 390K resistor in between. See last image below that I drew.
Hoping to find a proper schematic and opinions on the issue and wiring.
Thank you, Mark
Danelectro_centurian_275.pdf
Comment