Push Pull kit on a '75 4001

beatlefreak · Post by **beatlefreak** » Mon Jun 25, 2007 3:45 pm

Tony wrote:
" purchased one of Ebay with the resistor and I want to install it in my C64S. She needs a bit more low end."

Keep in mind that the cap does not add anything. All it does is cut the high end.

ajish4 · Post by **ajish4** » Tue Jun 26, 2007 1:32 am

Hey Kris,

Ok, now I'm confused....and it doesn't take much!

I thought if you BYPASSED or CUT OUT the resistor in the 4001's, the low end REALLY picked up. I thought it filtered out some of the bass?

Isn't the push/pull switch just putting in and taking out the resistor depending on the position?

I'm lost now! My C64S needs some more low end, I ASSumed by just bypassing the resistor would do that? Isn't that just what the Vintage Tone Switch does?

heinpete · Post by **heinpete** » Tue Jun 26, 2007 2:35 am

Tony don't let others confuse you! You're right, the capacitor in the original setting of the 4001 cuts the bass NOT the treble.

beatlefreak · Post by **beatlefreak** » Tue Jun 26, 2007 4:19 am

First off, it is a 0.0047 microfarad capacitor which the push/pull puts in and takes out of the circuit. With the cap in circuit, two things happen: 1)Volume from the pickup is decreased slightly; and 2)The low end (bass frequencies) are cut, or decreased.

My last post was in error. The main point here is that nothing is actually boosted - it is a passive electronic circuit, and cannot boost anything.

ajish4 · Post by **ajish4** » Wed Jun 27, 2007 2:46 am

Thanks Guys,

Not a problem, I just wanted to get some of the low end up on my C64S, I love the way it sounds but there are times I need to shake the stained glass, so I didn't just want to bypass the Cap. The VTC is the PERFECT solution.

On that note, anyone know exactly WHO came up with this idea? John? Ben? Just wanted to say THANKS. That switch is a pure delight!

johnallg · Post by **johnallg** » Wed Jun 27, 2007 5:55 am

Sergio, sorry for the delay - on vacation. The pot/switch replaces the bridge pup's tone pot. If you meant the little switch to lay in the bridge pup's rout, then you could just let it lay in there or hot glue it in place so you can reach the toggle. First I would just short out the existing cap with a bare wire and see if you even like the tone with the cap out.

captain_jetglo · Post by **captain_jetglo** » Wed Jun 27, 2007 11:44 am

Ok John, I get it. By now I just shorted out the cap and I also like this sound. So the answer seems to be the little switch. Thanks again. I'll try it, anyway if I get into trouble I'll ask for more.