Hello folks, i found an old 60s spinet Farfisa Foyer organ that uses tubes for preamp and amplification. So, the question could go for any tube circuit, old tube radios etc.
I noticed when turned the beast on, that two tubes (i think the rectifier and preamp ones) were turned on/ light on for about 2-3 seconds and then were immediatellt tuned off / stopped to light. Indicator "ON" lamp lights all the time and of course no sound.
What could this symptom be? I will fully re-cap it and swap old tubes with new, but i would like to know just before doing so.
PS. I think i ve read the same symptom on tube circuits here or in other forums, but cannot clearly remember (smthng like rectif and pre tubes cannot "keep their power" or smthng like that...)
Any input is welcome
I noticed when turned the beast on, that two tubes (i think the rectifier and preamp ones) were turned on/ light on for about 2-3 seconds and then were immediatellt tuned off / stopped to light. Indicator "ON" lamp lights all the time and of course no sound.
What could this symptom be? I will fully re-cap it and swap old tubes with new, but i would like to know just before doing so.
PS. I think i ve read the same symptom on tube circuits here or in other forums, but cannot clearly remember (smthng like rectif and pre tubes cannot "keep their power" or smthng like that...)
Any input is welcome