Princetons Revisited

[@PsionicAudio]

Thousand volt or 1 kilovolt. But I said thousand kilovolt…

[@thatampguy]

That’s one hell of a cap 😂

[@velutumbra]

That would be probably a Flux Capacitor.

[@Phantom_dave]

Only two legs tho

[@PsionicAudio]

Moar toan

[@hallanvaara6106]

A MILLION VOLTS

[@mattonthewater]

Great video on my pair of Princetons Lyle! Always amazed to watch your videos and I appreciate the knowledge, expertise and advice you’ve given me on them!

[@diegorhoenisch62]

I really appreciate your clarification about Fender's upselling strategy at the end of the video. Leo "blessed be his name" Fender wanted everyone to own a Twin. He may have been a nice guy(or not), but he wanted as much of the consumer's money as they were willing to give him. He was not interested in giving people "bargains". Cheers, Alan Berlin

[@TheMoodyLoners]

The kind of mild and very sensible circuit changes you often recommend and implement would only seem to send shocks of outage among the collector/speculator clients (the people who don't actually use these amps). I'm guessing the musicians/players would welcome them. Well done.

[@michael_caz_nyc]

He is Amazing. I love your informative videos. I am a mega-fan of the 65 Fender Princeton Reverb amplifier. Great stuff presented here. Cheers from NYC

[@DamonBates]

Pearl Clutcher, LOL, brilliant Im stealing that one! Today Uncle Larry coined "Crushed Mother of Toilet Seat" to describe triangular Rick inlays. 2 in on day. I should play the lottery.

[@bambule5268]

Great to have you back Lyle! Hope the bathroom is finishing soon!

[@jeffmaloney3843]

Thanks Lyle, great tip on the reverb supply node.

[@FileUnderMforMusic]

Can this mod be done with a standard can cap? thanks!

[@user-ri5gt9xo7f]

@@FileUnderMforMusic I think so. I did it to mine and seems to be ok. the hum did go away.

[@FileUnderMforMusic]

@ But would need a different cap fitted; a one kilovolt cap; is that what Lyle is saying?

[@bobcorbin7545]

Thanks!

[@milanberic9212]

Nice work Lyle. They sound just heavenly.

[@Vintage_375]

Thank you for including the part # for the cable glands.

[@DerpRulesAll]

It's so good to hear real, organic, Tremolo and Reverb; even with the hum!

[@martinreid1740]

Watching this after Brad's live stream, as ever really great work especially with with the new cap board and these amps should be good for many years to come. I agree that Leo was always wanting you to upgrade that's why I went through several of his amps ending up with a quad reverb. Just check out only the more expensive amps had metal corner protectors. If you don't post any new videos have a very happy and peaceful Christmas.

[@mattjohnson6916]

Those Heyco strain reliefs are fantastic! I wish I had discovered them years ago. Certainly would have saved a lot of aggravation and sore joints from installing new power cords.

[@vapidwind1014]

I love my 64 handwired reissue. Cost a fortune when I aquired it 4 years ago Has gone up in price over a thousand bucks since then because of Canadian insane inflation My friend modded the tremelo to get it slower for that swampy goodness Sounds great on the stock Jensen and even better on a 12 inch vintage 30 I have in an old cabinet Shouldn’t need service till several years after I’m dead and gone

[@bruceman9581]

Thanks for everything you do on this channel!

[@Dave-rk2nl]

Nice amps I can hear good tone, the tremolo is fantastic and the reverb is yummy

[@deedubslite]

Thanks for rambling! I'll take your ramblings any day.

[@omarmolina207]

I took inspiration from when you mentioned the reverb node trick a while back in a reissue video. I found it dropped the preamp voltage a good bit, so I decreased the 18k to 12k in the pi filter that feeds the formerly unused node. That put it back fairly close. I then came across Merlin's article on the reverb driver, and changed the 2.2k to 1.5k with the node voltage very near the 350v target he mentions. Additionally I increased the recovery stage cathode cap to 250μF to help with h-k noise (as the standalones did). Reverb is now clean and quiet all the way up to unusable levels. Thanks for the tip!

[@user-ri5gt9xo7f]

which resistor do you change? the 18k on the cap can?

[@HarryK-HK]

Killer amp for surf guitar. Cool to see and understand technology from the Mesozoic era.

[@Satchmoeddie]

I put radial caps in my old extra gain stage Williamson amp rather than use two unobtainable European mount FP multisection can caps. The last Princeton Reverb I did got a Hayseed Hamfest FP cap wrapped in cardboard (looks great) and I used 20,000 hour RADIAL shunt caps inside of it. The bias filter cap was the only axial cap I used. The Celestion Gold sounds great in that other Princeton.

[@sgt.grinch3299]

I was having Amp withdrawal. Thanks for posting Sir.

[@mikemorrisonmusic]

He’s back, everyone!

[@rob-french-data]

I appreciate the Mouser part number! 👍👍

[@joemcgraw5529]

I really like the fact that you did away with the Multi can cap ,Beautiful sounding amps

[@Strumbum01]

Thank you, Lyle! Great info!

[@rob-french-data]

"Another potential pearl- clutcher" 😅😅😅 missed that one the first time around!

[@kmetal83]

The best returns

[@andrewkorner8323]

That first amp sounded perfect

[@jerryking2418]

Very nice work. Soon you'll be called the Amp Whisperer.

[@kseon60]

I would like to see, how to do reverb hum mod on princeton. Great work !

[@user-ri5gt9xo7f]

so would i. do you change both 18 resistors?

[@rockinchairboogie3222]

Lyle as always another good video, will you be showing more work you have done in the bathroom and your plumbing? I enjoy all that to dude. Merry Christmas!

[@PsionicAudio]

I will soon. Thanks!

[@mikaloor7836]

I always tell people that the red turd caps are actually good. Thanks for saying it

[@ericluttinger6546]

Great video!

[@michaelfuller34]

Wow! do you think the reverb tube wiring error was a systemic CBS error? Or was this a Friday afternoon amp? Thanks for your amazing videos!

[@rlsmith6904]

Sounds good. Thanks.

[@monkeyfinger7949]

Excellent video. I feel like I'm in amp college.

[@rustymohican8280]

Inspiring work!

[@GratefulSam-et3ve]

More great work!

[@elbowjames7625]

Calamitous! Don't hear that every day in amp service videos.

[@tedmich]

Ramble on Lyle !

[@rebbeachfan]

Another great video, @PsionicAudio. Have you had a chance to work on the '64 handwired Princeton reissue? If so, is it as bad as the '64 Deluxe Reverb, or did they stay more faithful to the original design?

[@PsionicAudio]

It’s more faithful but way overpriced for what you get. Only possibly justifiable on the used market. jmtc

[@TheMegaRonin]

I'm on my third. They sound great, but still have the reverb hum! I run mine through a Brakelite so don't really hear it. I upped the first 2 filter caps to 33uF when I fitted F&T filters which helped, but it's a design flaw.

[@victorbeebe8372]

Mahalo Lyle!

[@raulgrangeiro]

Friend, I would like to ask you a question about something I can't find the answer anywhere. If I use a Les Paul with 500kA pots on neck pickup and 250kA pots on bridge pickup, the middle position, when the caps are in parallel, what is the final measure of the pot for this position?

[@user-ri5gt9xo7f]

for the reverb mod do I just move the wire that is connected to the 220k resistor to the unused node?

[@thatampguy]

I like pearl clutches and couch fainters.

[@TheMegaRonin]

Thanks Lyle, appreciate the time you spend making these videos. On moving the reverb supply, would you need to alter the internodal dropping resistor value? Thanks.

[@PsionicAudio]

You can but I did not on these vintage ones, as it would involve changing still more components. But that would be to increase preamp headroom, doesn’t really affect the reverb driver. Just adding that next stage of decoupling/filtering does the trick.

[@TheMegaRonin]

Tried it on my latest build, and yes, it absolutely works. Zero reverb hum!

[@user-ri5gt9xo7f]

@@TheMegaRonin did you change the 18k resistors as well?

[@TheMegaRonin]

Just went with moving the wire to the vacant node.

[@user-ri5gt9xo7f]

@@TheMegaRonin you just moved the wire connecting the 220k resistor?

[@velutumbra]

Any improvement kept a bay for the sake of "authenticity" is a way to eventually get an authentic pile of ash.

[@BenTorresMusic]

Hello Lyle, I am in the market for a combo amp around 3k or less. I currently own a Vibrolux Reverb from 73 and am looking for something a bit more Marshall-esque. I want the ability to have great cleans and I mostly use pedals for OD. Any suggestions? Love the channel, thanks!

[@Acornhouseworkshop]

I was just wondering how things were going Psion way.

[@lordgraga]

At 8:30 you hit some chords hard and there is a kinda nasty sounding distortion. Is this completely normal for that kind of circuit? I am curious what makes a clean and clean and a crunch amp crunchy... I feel like you don't really hear this in the mix but when I get that kind of distortion on my own amps it bothers me.

[@tjminasi1442]

On the reverb transformer modification to re-connected to the 320V node, might the reverb driver tube cathode bias resistor be changed to 2.0k or 1.8k ohms to try to maintain a similar bias to the 2.2k/8V of the original circuit? Or is it insignificant?

[@PsionicAudio]

Not a big deal. Notice Fender kept the cathode constant no matter the b+ changes in different models.

[@mgoo1713]

I really want a Princeton reverb, unfortunately a classic amp is out of my price range....

[@PsionicAudio]

A used ‘65 Reissue is always a good bet.

[@merrillaldridge2775]

Why is it called a Reverb "Tank"? I know it may be trivial, but how did a metal box with springs get tagged as being a "tank"? Doesn't seem to hold water.... .... ... .. . I know....I couldn't resist. Character flaw....

[@aidantalbot9495]

around 2 minute what are the little lumps of brown lying on the board ? look like maybe capacitor casing ?

[@PsionicAudio]

Little bits that flaked off the old ceramic disc caps in the LFO.

[@aidantalbot9495]

@@PsionicAudio nice sharp pictures, great sound and work, thank you

[@yernickle]

How long are the standoffs for the filter caps board ? thanx

[@PsionicAudio]

1/2” is what I used.

[@SoloPlaticando-ts4xx]

I have three of these amps end never played anything interesting, he seems like my perfect amp tech.

[@mattrorke7536]

Lyle, why do they spec 1kv caps for the tremolo circuit?

[@PsionicAudio]

Fender used 500V caps. I like the extra headroom.

[@davidisenberg125]

have you ever worked on a dumble ????? are they really as good as i have heard or just rich boy amps ????

[@PsionicAudio]

Yes, a long time ago. They’re very good amps but way overhyped. Carlton’s best tones were a 5E3 Deluxe. SRV sounded amazing on Live at the El Macambo with a Super Reverb and a Vibroverb. They also sounded great with Dumbles, but the amp was just a good amp. It was the player.

[@davidisenberg125]

@@PsionicAudio thank you sir !!!!! your advise has saved me tons on piss poor amps

[@Hipyon]

That's only a megavolt it would make me tremolo

[@aaronglassonion]

Hello Lyle. I sent you an email asking some questions about servicing a Mesa Boogie. I have an OG AOL address, so I would imagine it probably went to your spam. If you wouldn’t mind checking that for me, and getting back when you get a chance, I’d super appreciate it. Thank you! Aaron

[@wallpapermusique]

I was going to thank you for not using that auto-zoom but then I noticed it started up at 4:40...so I stopped watching.