Thanks folks, problem resolved for the time being. Found a Fender replacement pot that was intended for a Blues Junior (tho was listed as a replacement for the BJ treble pot, not the bass that I needed. This seemed to have the same electrical characteristics so in it went and it seems fine. Then noticed that the printed circuit around the input jack was lifting away so I had to fix that as well.

Time to think about a suitable replacement I guess, I might try the Vox Pathfinder or a Night Train, I fancy a vintage Vox AC15 but doubt I could justify that to the missus! I started out with a Watkins Dominator (twin, angled front jobbie) .....sold it for £20 in 1969, now they sell for thjousands!
Thanks again,

Wayne.

I've eventually tracked down a fault in my Fender Frontman 15R, to the Bass tone potentiometer. Here in the UK parts like that seem to be hard to find. Does anyone know of a USA source, or, failing that, would it be possible to bridge the faulty pot out altogether. At least then I would be able to use the amp.
The current pot (which I've removed), bears the number 30C250K
Thanks.
Wayne.

Dear J M Fahey, I've stripped the amp again and checked the circuit board against the schematic as you suggested. In the main the components appear to be the same but as I've got the "R" version there are also some differences  -an extra pot for the reverb etc., and I've got Auxillary inputs instead of an external speaker jack. Any suggestions as to proceed?
Thanks and best wishes,
Wayne.

Thanks for your help. I'll take the circuit board out again as soon as I get the chance and compare it to the schematic. My soldering skills are adequate but I'm not so sure about my schematic reading! I've worked with various electrical plans in the distant past but these electronic ones look pretty complex and some of the symbols are a mystery to me. I've got a couple of busy days coming up but I'll strip the amp again on Saturday or Sunday.
Thanks again. More anon,
Wayne.

Hi!, my Frontman 15R had been working ok until 2 days ago. On switching it on then, it immediatly started to howl extremely loudly. Even setting all the knobs to zero and unplugging the guitar made no difference at all. I'm comfortable with repairing most elecrtical items but electronics is a grey area for me. I've removed the circuit board but cannot see any obviously faulty components or dry joints. I guess the amp is "dead in the water" given that they are fairly cheap to buy. I just wondered if there was anything I could try to trace the fault as the amp is otherwise ok. Thanks.
Wayne