Recently, my PS-2 putting out a shrieky, spiky squeal that lasts for about 10-20 seconds. Happens about 2 to 3 minutes after powering up. Then, it stops, and doesn’t come back while I’m practicing. This happens whether my amp (Divided By 13) is plugged into the PS-2 or not. Any suggestions as what is causing this? Thanks.
A loose power or preamp tube in the socket, or with an intermittent internal element can cause this. It stops after warmup because of internal heat expansion.
Try reseating the tubes in their sockets and see what happens.
If it persists, try replacing the preamp tube or power tubes.
Please reply back afterwards with your results.
Dave