Part 2 is live! kzitem.info/news/bejne/mIdus32rsYirZoIsi=aYsTP44jq2wrunQd
@thatampguy
2 сағат бұрын
Back to the top!
@petercornell2002
Жыл бұрын
The 2 back to back diodes isolate the audio ground from the chassis to eliminate hum loops. Also common to use a 22R 2w resistor for the same result.
@JEmilioJNava
11 ай бұрын
yeah, RIs have those ... electronic security regulations
@christophertrimmer625
Жыл бұрын
Excited to go on another project roller coaster with you!
@YeatzeeGuitar
Жыл бұрын
😂🙌 Just wait, got a big one coming soon that I have parts arriving for today... something I don't believe anyone's shown before on YT.
@christophertrimmer625
Жыл бұрын
@@YeatzeeGuitar Nice!
@Metaltrippin2
10 ай бұрын
Loving your videos. I just got a Roland super cube 60 from the 80s are there any cool mods I can do to it ?
@YeatzeeGuitar
10 ай бұрын
Thanks! Hmm for something like that, a solid state amp, I'm not really sure. No familiarity there
@Guitar5986
Жыл бұрын
Great work as always!
@YeatzeeGuitar
Жыл бұрын
🙏
@JEmilioJNava
11 ай бұрын
about the "blue molded" caps ... did you measure the capacitance? ... maybe it is a printing error ... none 1uF caps are present in Fender circuits ... so no need to have them in stock at the factory.
@YeatzeeGuitar
11 ай бұрын
Certainly a possibility!
@kmajor44
Жыл бұрын
If you covered this in the video I apologize as I watched and rewatched. Why are you stuffing the old caps?
@YeatzeeGuitar
Жыл бұрын
Mainly because I've always wanted to try it! Outside of that, I'd boil it down to A) it's my own personal reverb unit I have no intention of ever selling B) I really dislike the look of modern tiny 25uf 25-50v caps in place of the vintage 25uF's that are 10x as big. It's an aesthetic thing.
@kmajor44
Жыл бұрын
@@YeatzeeGuitar i see, got it. Like restoring a Coke machine from the 50’s with modern technology on the inside. If you do sell it, just provide this video link. 🤗
@YeatzeeGuitar
Жыл бұрын
@@kmajor44 Obviously any work I do is documented 10x more than just about anyone else outside of a select few. But that being said, to plays devils advocate for a second because I do think that's an interesting perspective, what is the reason why you asked originally? In this video I stuffed two original electrolytic caps. There still exist one of the three on the board that is not original, so in a fictional world where I sold this and say the next owner sold it without sharing this video what is the harm you're insinuating could exist? It's clearly not all original if there's still 1 of the 3 caps on the board that's not an original astron (cover) so it couldn't be someone posing it as an all original "museum" or "collector" grade piece right? So is it that a future tech might get it and instinctually replace the 25uf caps because they look original at first glance? Those mod 25uF caps are less than a dollar each, so not exactly a big financial hit. Just curious! I think there's a lot of knee jerk reactions to certain things (like removing 5th bands on NOS AB resistors, or changing gold bands to silver bands) without really thinking too deep about it. Obviously a lot of strong opinions out there 😉
@kmajor44
Жыл бұрын
@@YeatzeeGuitar I meant no harm and really have no motivation other wanting to know yours. I have not seen it done until now. Psionic replied to a comment/question on his live show recently about this very thing. His reply was that it was not a good idea. He purposely stayed away from going any deeper but only offered up to discuss it further offline. I am not a builder or a critique of builders. I am just a consumer of this content. I dig your vids. I like learning and love guitar gear but dislike gear snobbery. Really appreciate you taking the time to reply further and was not trying to put you in a defensive position. Lastly, holly cow there is more circuitry in a stand alone reverb unit than I ever would have imagined!
@YeatzeeGuitar
Жыл бұрын
@@kmajor44 He was talking to me haha, we chatted on the phone afterwards about it. 100% valid concern about stuffing caps depending on the context, that's why I was just curious what your thoughts were (not being argumentative, sorry if it comes across that way, genuinely curious!). From Lyle's perspective, he's working on customer amps and he rightly wants to show how good and clean his work is and not have it hidden. He has other reasons as well, get it 100%. I don't think people actually try and position amps with stuffed caps as all original amps, but I may be naïve on that. Yeah they've got more going on than some small amps even! Really cool units, love mine.
@JEmilioJNava
11 ай бұрын
Since you were redoing the ground connections ... installing an artificial center tap in the filaments would protect your power transformer. Also ... you iron was too hot/big ... that's why you melted the insulation.
@YeatzeeGuitar
11 ай бұрын
Unfortunately there is no middle ground with irons, I can't adjust the heat. Melted insulation is a user error as much as anything, I still find chassis grounds the hardest part of amp work.
@JEmilioJNava
11 ай бұрын
@@YeatzeeGuitar try the Weller 80W iron ... good size en enough heat
@matthewf1979
Жыл бұрын
I’m not necessarily against “re-stuffing” caps. I get why people do it. People can be taken for a ride if they’re looking for a museum piece. It is strange to see 1uf caps in the first stage. A 0.1uf cap completely passes any frequency and guitar could produce. I wonder if this was a custom order or something. Maybe for accordion or an organ. The diodes between the chassis and ground wire is a new one on me. They’re huge too. At least 5 amps, probably 7 or 10 amp rated. I would guess it’s for noise reduction, but I’m not sure.
@sluckey08
Жыл бұрын
I'm pretty sure the caps are 0.1µF. The decimal point is just rubbed off or obscured. A 1µF cap would be much bigger. Checking them with a meter would confirm. The diodes are meant to deal with the ground loop. However, they are isolating the earth safety ground from chassis which is not good. The idea is to remove all circuit grounds from the chassis and let the circuit grounds float. Then connect the floating circuit ground to the chassis earth ground through the back to back diodes. There should also be a resistor and cap across the diodes. This arrangement breaks the ground loop between the 6G15 and the main amp caused by the shielded cable between the two devices. This was not a problem back in the '60s because the 6G15 never had a three prong power cord. Look at the schematic of the reissue 6G15 to see how Fender solved the issue when they installed a three prong power cord.
@YeatzeeGuitar
Жыл бұрын
@@sluckey08 I'm looking at them now, don't see any evidence of a period being rubbed off and it's definitely not obscured. Perhaps the label itself was the wrong one, and a manufacturer defect before Fender even got them in the parts bin? Interesting about the ground / diode, i'd not heard of that before. I have a reissue 6G15, I'll have to take a look if I get a chance and see what they did there. Hoping as-is I'm not going to have noise issues after updating the wiring, it didn't present any issues when I used it prior.
@sluckey08
Жыл бұрын
@@YeatzeeGuitar I think you can accurately measure the value of those two caps in circuit. If not just lift one leg. I'm pretty certain you will find they are 0.1uf. A 1960s 1uf @ 400v probably would have been too large to even fit the board. Take a look at the schematic to see the simple ground isolation circuit, CR5, CR6, and R23. They are located at the bottom of page 7 and connect between the floating circuit ground and chassis ground. Other than the green power cord ground this is the only other connection to the chassis. This simple circuit will break the ground loop and still maintain earth ground connection to the chassis. If you don't have a schematic you can get it from Hoffman's schematic library, fender section, filename is "Fender_63_reverb_manual.pdf". I posted a direct link yesterday but the comment was removed. I suppose by a youtube bot that doesn't allow URLs in the comments section??? This simple ground loop isolator circuit is a simple addition to an amp during the building stage but would be a nightmare to try to add to an original 6G15. There are commercial units available at the big music stores such as sweetwater or musicials friend. Please let us know if you have hum issues when you get this unit back together. BTW, the two diodes that were in your unit do work but you lose the safety feature of connecting the green power cord wire to chassis. BTW, I built a Revibe Unit (6G15 + harmonic vibrato) and had hum loop issues. Since I only play at home I opted to simply cut the green power cord wire loose from the chassis. No more hum.
@YeatzeeGuitar
Жыл бұрын
Jeez, nothings ever easy is it! I tried doing some research last night but yeah seems like it's always with scratch or kit builds that people completely change the grounding scheme. So with that in mind I guess we'll have to see, to your point, if it hums or not. If it does, I'm not opposed to going back to a 2 prong. I intend to continue gigging with this spring tank, it's a part of my sound. Pretty frustrating!
@sluckey08
Жыл бұрын
@@YeatzeeGuitar Hmm. I just made a comment with lots of good info about 30 minutes ago and now it has disappeared! No URLs this time. Now that is very frustrating. Are you removing my comments? Or is there maybe something in your setup that tells youtube to automatically delete comments base on some criteria?
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