I have a graaf 13.5b preamp feedback
I have a graaf 13.5b preamp. I recently changed tubes. (sovtek 6922 to miniwat e88cc). When i use the input selector of my preamp i get a increasing hum from my speakers. I had no problem before the change of tubes. The techinician who checked the preamp found nothing wrong.
Please advise.
Please advise.
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Answers & Comments
Hi Geo,
Did you solve the problem, By the way I'm thinking buy a graaf 13.5B II, Can you tell me your experience? what you think about this preamp? it is quiet did the tubes make any noise (HUM, HISS) I have a very sensitive speakers (105db). Please hekp me to decide.
One of the new tubes was faulty.