Hi All, I am preparing an order for tubes (preamp tubes for a Marshall 6101 LM - 5881 based, needs 7 !) and would like to add bits and pieces to tweak / test some voicing changes on a 5F1 kit by Tube Amp Doctor. The kit is a pure 5F1, same components as on Fender scheme with negative feedback loop and no V1a bypass cap (as per scheme, even if I read a lot of 5F1s did have a bypass cap in reality). I made the kit with a Jensen C8R - 4 Ohms (which I put in for clean sounds I was after) and so am considering a couple tweaks to see if I get other sounds I like - let me know your thoughts: #1 Jensen C8P - 4 Ohms - my understanding is it would break earlier than the Ceramic, could be good as I'd love the amp to break a bit but don't play it beyond 4-5 volume as even 5W is loud in the apartment... #1a Was planning to build separate little cabinet and plug-in either the Ceramic or the Alnico one. Worth looking at power resistances and jack socket(s) to arrange both to be plugged in your opinions ? #1b Or would you here recommend a power attenuation to try to get the Ceramic to break instead #2 Negative feedback loop switch - an obvious / easy one (RobRob's favorite ! love the site !). While at it, do I buy 13, 27 and 39kOhm resistances to try vs the 22k original ? How many would you leave in situ (so I know what switch to buy: SPST, SPDT, SP3T ?...) #3 V1a bypass capacitor: a 25uF / 25V as shown on the Fender 1E1 scheme ? With an SPST switch to be able to go back to "original" or you'd also recommend trying other capacity values while at it ? #4 V1b bypass capacitor: I've read posts on this forum of people having this but can't see it on any champ schems, what would it do, what values do people test here ? #5 Add a tone like on Princeton 5E2 ? Thanks !