Thought I'd share my experience of my Gremlin amp. I touched on this briefly in another post where I mentioned the ABY switch sapping the tone, which has now been discarded, but the other main problem I found with it was when running it on maximum attenuation which I do from time to time when my tinnitus is playing up or it's the early hours and I can't sleep and end up in the music bunker, was that the tone really suffered and the sound went all fizzy and harsh. The normal TK attenuator has an adjustable presence switch to compensate for this but the one built in to the Gremlin doesn't. It was almost like the attenuator was struggling to cope with the amount of power. I bought some new valves from China, (I've found a good seller on eBay and the quality of the valves is as good or better than I can get from a retailer in the UK, not harsh, just a great tone), and I swapped out the power valve for a 6V6 rather than the KT66, and substituted the first preamp valve for an AT7 rather than AX. Problem solved, great tones at all attenuation levels and slightly more headroom, still plenty of overdrive. Hope someone with a Gremlin amp reading this finds it useful. The SilverSky into this amp now sounds amazing and I don't think I'll ever need another amp, finally got the sound I've always wanted.