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Hybrid Tube Preamp - Loud Pops and Crackles

My stalwart VTL 7.5 iii pre is broadcasting loud pops and crackles through my speakers, scaring me about damage to the speakers. First, I thought my aged 12au7 NOS 7316's tubes were dying, so I replaced them with NOS Amperex Bugle Boys. The pre started with the loud pops and crackles again.

Are both of these tubes dying, or is the problem with the pre itself? Any thoughts? Thank you. Neal

nglazer

Showing 2 responses by nglazer

nglazer OP
845 posts
 

One colleague (oddiofyl) above suggested re-tensioning tube sockets.

 

I will follow your suggestions and see what happens. I too am surprised two sets of tubes causing the same noises, so it is unlikey the tubes are the problem. Thank you. Neal

nglazer OP
845 posts
 

Thx, colleagues. I will tool with the tubes and tube sockets and play with the volume control ( a possibility) and the IC cables (RCA and XLR). Beyond my skill to deal with cap or resistor. I am in NYC and hope I may not bother you -- but I might. I am on CPW. Cheers. neal

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