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Tube Question

I have an amp that has Russian Tubes. This amp purchased in the 90's has always had a hum to it which when playing music isn't heard. I'm thinking of buying 1 6SL7 and 1 6550EH tube to swap out and see if I can find if one of the tubes is the problem. The 6SL7 is Sovtek and the 6550EH is electro-harmonix. Should I replace with a similar tube from another company or continue with the same company? Is this approach to finding the problem sensible or a waste of time?
128x128jcbach

Showing 3 responses by jcbach

jcbach's avatar
jcbach OP
46 posts
 
Thank you for all your responses. Dealing with the transformers is beyond my pay grade. Does anyone have a suggestion on where I should send the amp for professional repair?  I live in the northeast US  but would be willing to ship it anywhere.The company that made the amp no longer exists so that isn't an option. 
jcbach's avatar
jcbach OP
46 posts
 
Thank you for all your suggestions. lewm the sound is through the speakers. I've been told that tubes after 10 years should be replaced as they might draw way higher current and create a stress on the power supply and create hum. I've also been told that transformer noise is mechanical noise and would not be heard in the speakers. It seems like replacing the tubes is the initial way to go as the tubes I currently have don't seem to get high marks anyway.
jcbach's avatar
jcbach OP
46 posts
 
@analogluvr  I contacted Andy at your suggestion a few days back through his website and shared what I have for tubes as well as the issues. Still waiting for a response. Not sure if he's on vacation or just not interested :)
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