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ADJUSTABLE Bias mod on vintage fender amplifiers (easy) | PART 1 

Yeatzee Guitar
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Part 2: • Comparing Bias setting...
In this video I show you how to make your bias adjustable on a Fender Princeton. This also works for Fender Champ and Vibrochamp models which are fixed bias like the princeton is. To see more work done to this amp, check out the playlist here: • 1968 Fender Princeton ...
00:00 - The subject!
00:30 - Parts list
02:56 - Adjustable bias pot discussion
04:02 - Why adjustable bias is good
05:17 - How to remove the original components
08:00 - Discussion about solder domes
09:14 - Something else to look out for
10:41 - Installing the new components
13:58 - Solder I recommend / use
16:42 - Bias cap install
19:20 - Trim pot install how-to
20:55 - Overview of the bias circuit
22:42 - Last of the solder connections
23:24 - Check resistance range
24:22 - All done! ... for now
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Sponsor a coffee if you appreciate the content 😁: www.buymeacoffee.com/YeatzeeG... Follow me on Instagram: / yeatzeeguitar

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26 июл 2024

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Комментарии : 21   
@YeatzeeGuitar
@YeatzeeGuitar 2 месяца назад
Part 2 can be found here: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-ysPYG7NXByw.htmlsi=j59D11UxLcwZUFQP
@TheyreStillOutThere
@TheyreStillOutThere 24 дня назад
Super helpful, thank you. You're the antidote to the crabby/complainy self-important middle aged amp repair RU-vidr culture that I'm getting pretty tired of. You and Colleen are making this stuff cool again.
@offkilter
@offkilter 2 месяца назад
The camera angles and pacing of your walkthroughs are the best on YT. You're killing it
@YeatzeeGuitar
@YeatzeeGuitar 2 месяца назад
🙏🙏🙏
@DannyDKNYC
@DannyDKNYC 2 месяца назад
This was an excellent video. Just what I was looking for. Great work!!!
@YeatzeeGuitar
@YeatzeeGuitar 2 месяца назад
Oh good, I'm glad!
@jjshouseofjams522
@jjshouseofjams522 2 месяца назад
Awesome 🤘
@sgt.grinch3299
@sgt.grinch3299 2 месяца назад
Thank you.
@nbosticiii
@nbosticiii 2 месяца назад
Very well done. Thank you. What overhead camera are you using?
@YeatzeeGuitar
@YeatzeeGuitar 2 месяца назад
Sony A7III. Thanks for watching!
@BCEpedals
@BCEpedals 2 месяца назад
The PTx and Those cathode bypass caps are original?? Great video, btw!
@YeatzeeGuitar
@YeatzeeGuitar 2 месяца назад
Yes sir, replacing all of the filter caps was done in different videos already uploaded to the channel.
@BCEpedals
@BCEpedals 2 месяца назад
@@YeatzeeGuitar Nice! That’s a clean amp!
@huddyskiba1
@huddyskiba1 2 месяца назад
You know I was wondering why you didn’t “strap” the wiper to the other lug of the trim pot so in the rare event of a trim pot failure you wouldn’t lose bias. But after thinking about it, if the trim pot loses its ground reference the bias voltage just goes more negative, right? So it doesn’t really matter if the ground reference is lost, right? Gets a cooler bias, might not sound as good if it dumps to 35% but it won’t hurt anything… Maybe?
@YeatzeeGuitar
@YeatzeeGuitar 2 месяца назад
You're right, it'd be better to ground that lead along with the wiper in a catastrophic failure event
@nedsheats4600
@nedsheats4600 2 месяца назад
Since you are improving the circuit why not replace the 100K 1/2 W with a 1 Watt 5% metal film. since it is connected to the HV secondary it is under more stress than most other 1/2 watt resistors in the amp?
@YeatzeeGuitar
@YeatzeeGuitar 2 месяца назад
I don't swap carbon comps for metal films in all original clean vintage amps like this. This adjustable bias is about the only thing I like to do beyond following vintage spec on these. Ymmv
@BCEpedals
@BCEpedals 2 месяца назад
(Not trying to be negative or facetious) ; but That 22k joint opposite the trim pot is definitely a cold joint. You can tell by the solder is formed around, not with, the resistor lead. Being educational, some people might not know the difference or the need to reheat the joint. Just trying to be helpful!
@YeatzeeGuitar
@YeatzeeGuitar 2 месяца назад
That's caused by the old lead of the resistor being dirty so the solder doesn't want to stick to it as much as clean fresh components, not because it's a cold solder joint. The resistor is crimped around the eyelet with a solid mechanical connection and solder flowed freely across the eyelet. That being said, I knew and as you'll see in Pt 2 releasing shortly today, 22k was never going to be the right value for a usable range in a Princeton so it was always going to get swapped.
@YeatzeeGuitar
@YeatzeeGuitar 2 месяца назад
My mistake, its already out: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-ysPYG7NXByw.html
@BCEpedals
@BCEpedals 2 месяца назад
@@YeatzeeGuitar right on man! Iron sharpens iron, I think you’re doing a great job!
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