Sound City 30C Mark 6 - occasional soft motor boating

[mikeydee77]

Hi, I have one of these Chinese re-issue combos not sure of age but assuming 5-10 years old. It is a 6L6 pp based amp with two pre amp valves and reverb....

[blindboybenton]

Hi.. Ive got a British built Selmer PA/4 100watt PA Head.. I brought it from Ebay.. Did a full service 2 x Gz34 and 4 x EL34 JJ's and all new electrolics...

[Boxbie]

Hiya,

My weber 5e3 clone which I have had working (on and off) since 2009 has now started motorboating when the volume controls are high. All...

[xgabrielx]

Actually, I don't know if motorboating is the best way to describe it as there is also a high pitched sound, oscillating at the same rate. It's a kind of...