Hello! I own a 1969-1970 silverface twin reverb with oxford speakers with AA270 schematic(http://ampwares.com/schematics/twin_reverb_aa270.pdf) [What's the difference between AA270 and AA769?Apart the cap before the phase inverter) as far as I can see. I believe everything is stock apart the tubes.Tubes are 6L6 GC special design for Fender and preamp tubes has the same design for Fender stamp also.(Apart one philips ecc83 at slot v5).Unfortunately there was no tube chart info. I am willing to do some changes with that amp.I am not an amp tech and I don't have the ability to do it. I have a friend who is electronic engineer but not an amp tech. He is going to do all the soldering job and mods.But I have to tell him according to my research what he should do. But before I go forward I have some questions.So if anyone can help it would be appreciated.So here we go. 1.Power supply filter capacitors: These are going to be changed with TAD AudioCap 20uF 550V and 70uF 350V. According to http://www.el34world.com/charts/fenderservice7.htm I should change the 1w carbon resistors with 3w metal film resistors.Is that ok? 2.Electrolytic caps: All 7 will be replaced with Sprague Atom 25uF, 25V or TAD GoldCap-BP 25uF 25V.I have both but I am not familiar.So if anyone had experience with both his opinion is welcome. 3.Tubes: I have a spare quad JJ 6L6 and will try on them but I was wondering if I can something better.Some people propose 7581A/PHILIPS.These are expensive but are supposed to be the ultimate(?!) Preamp tubes:A good adive on that section is needed too. 4.Speakers: It has oxford with number 465-951 12T6-11. a)According the numbers on the transformers amp is made between 69-70.Thats according to producing time fender gives.According to the serial number (A21400 to A25600 1970, http://www.superiormusic.com/page195.htm) it is made in 1970 BUT according to that: http://www.webervst.com/codes3.html and http://www.webervst.com/codes.html twin reverbs were not supplied with oxford speakers after 1967(that's a question for some historians) b)I will change them for sure cause the one is ripped and glued very good...i am not pleased with the sound of them.Too muddy with cleans and like f*arting with drive pedals. I've listened to clips from jensen site and I really liked P12Q and P12N. From weber speakers they proposed me https://taweber.powweb.com/weber/chicago12f.htm cause fits me needs for clean and for smooth overdrive. On the other hand I see some others proposing speakers like Eminence Delta Pro A12 with 400watt that I feel it's overkill(or isn't).What is the tonal difference among 50-80w and 400w power? 5.Do you think wiring should be changed?I don't intended to rewire all the amp but is there any spot that should be wired with better quality of wire? 6.Bias Pot and voltage... I found many guides how to make the balance pot into bias pot. All of the guides just say to convert the AA270 to AB763.Doesn't matter that the voltage from the tubes doesn't match??? 7.All coupling caps will be replaced with sozo caps.(i've received today ) Shouldn't I? The only problem was that I could find a coupling cap in the phase ivnert of 0.001μf,i've picked a .001 400v SoZo Vintage Cap.What did you used instead? 8.According to http://acruhl.freeshell.org/mga/main/silver_twin.html and the 7 steps above,there are only few things to change to blackface.My question is if that's the right way.Should I convert everything to blackface? 9.read about the 3 prog power cord.Mine SF is european model.3 wires.The 2 of them are going to the ground switch and the 3 is grounded on the chasis. And from the ground switch it goes to power switch,at the fuse and at the 1pin of the V9 power tube.Is that ok? I hope i've not forgot anything.I'd like to thank in advance for the help and sorry for any english misunderstanding and my ignorance on technical matters.