Another Unicorn?!? - Vintage Princeton Reverb Amp Repair Pt.1

Рет қаралды 670

Күн бұрын

Start of a new series tackling a 1973 Fender Princeton Reverb. Should be a fun one!
Princeton Reverb Playlist: • 1973 Fender Princeton
00:00 - New amp
00:27 - Chassis first look
02:17 - Transformers and tubes
04:48 - Confirming amp safe
05:48 - First review of chassis
13:03 - Parts provided
15:36 - Replacement filter cap trouble
18:10 - Again?!? No schematic
22:39 - What I found
25:24 - Missing bypass cap
28:54 - Next steps
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Пікірлер: 24

@YeatzeeGuitar 11 ай бұрын

Alright let's hear it, what are your thoughts on this weird little piece of fender history?

@J.C... 11 ай бұрын

Did you check the 30+ Princeton schematics at el34world? 5c2, 5d2, 5e2, 5f2, 6g2, aa964, aa1164, etc??

@J.C... 11 ай бұрын

Aa964 has 1 cap at the V that's missing that 25/25 cap. That's as far as i got though.

@YeatzeeGuitar 11 ай бұрын

@@J.C... 5xx are all tweed, 6g2 is brownface. 964 is blackface non reverb, 1164 is blackface with reverb.

@kellykane312 Ай бұрын

The 12at7 is the reverb driver and both cathodes are combined together and you only need one bypass cap

@huddyskiba1 10 ай бұрын

New drinking game… “TBD” 😅 Keep ‘em comin’!

@YeatzeeGuitar 10 ай бұрын

Oof try it if you dare 🤣

@laserflexr6321 11 ай бұрын

Early 70's had a lot of shenanigans in electronics. The kaliedoscope wires is likely cause they had to take whatever wire they could get, huge undersupply of copper at that moment. Viet Nam telecom network, LBJ, Ladybird, Anaconda copper, all that stuff. My dad's company was disassembling old transformers to reuse the magnet wire to wind the transformers they needed cause copper wire was almost impossible to acquire for any but the biggest corps. I bet if you bend the leads on that cap about 3 more times you can get them to break, dont let up now.

@YeatzeeGuitar 11 ай бұрын

Makes perfect sense

@sluckey08 11 ай бұрын

The missing bypass cap was done intentionally to reduce the gain of V2 (reverb driver). I suggest leaving it as is.

@advanceddragonchasing2286 11 ай бұрын

@Yeatzeeguitar This man knows his stuff... Grasshopper listen to Miyagi... wax on...

@sluckey08 11 ай бұрын

Remove the original cap can and put the JJ cap can in the hole. Drill two screw holes for the mounting bracket. May need to enlarge the cap can hole a bit. This will be the cleanest replacement and allow plenty of room for the bias pot.

@YeatzeeGuitar 11 ай бұрын

Owner wants to keep the original can cap. Would definitely need to enlarge the hole too, the JJ's pins on the ends are just a hair wider than the existing hole diameter. The only working idea I have is to get one of those cap brackets you see on vox's to hold it down + silicone and then I'd need to flatten the original can cap pins and silicone over those as well. Otherwise individual caps placed where they'll fit + little terminal strips. TBD!

@christophersambuco9414 10 ай бұрын

I had not such great luck with the cap caps sold through Antique Electronics...the first one was no good, the second one is still working. When I sent back the first one, they said that they could not find anything wrong with it. I told them that the second one that I bought works fine (it does for now). They acted like a refund was doing me a Big favor.