dsper, I spoke with the factory today. Jeff asked that you use the website "contact" and send a message and he will get back to you.
- 18 posts total
- 18 posts total
I know you are discussing an amp, but I recently had this exact problem with my tube preamp, especially the awful thump. Like you, put in new tubes and same thing happened. Was about to send my unit for repair when I decided to ask the distributer if there was a repair facility they recommend.
The distributer said before sending it in that the problem may be caused by a loose tube pin socket and there are two ways to check this; One is to gently pinch the socket sleeve using small pliers to make the pin contact tighter. The second is also quite effective but easier to do. Simply bend each tube pin slightly inward and outward for better contact with tube pins slightly bent in opposite direction. The point is to create more tension inside the socket holes for a firmer grip.
I couldn't believe it worked like a charm. Used the second method which took all of minute.
As a side note, it is remarkable how much more robust my old school preamp tubes including Telefunken, RCA and GE are built compared to newer Psvane tubes, especially the pins. I was not careful and one of the Psvane pins broke off, no chance of it happening with the NOS tubes.
@celloover, dsper, I spoke with the factory today. Jeff asked that you use the website "contact" and send a message and he will get back to you.
Thank you for that!
I installed anew set of EH 6550 power tubes today and the amp is still doing the same thing. The sound stops on the right channel and then there is a thump and then a buzz as the power comes bac. Doers this every few minutes..
I will contact Jeff and see what happens.
I appreciate everyone's interest and suggestions.
Thanks for listening,