Back to shielded cable; where to use

[skyboltone]

I'm at the nitty gritty part. I'm intending to use RG-174 (grounded one end only) at the following locations. Please comment, rant, instruct, or other wise opine as the spirit moves. This is a RevA con todo.

1)grid of CL1 (22k) to input jack
2)grid of CL2 to (res/cap pair) to vol pot.
3)OD drive wiper to grid (180k) of CL2
4)OD level pot to 150K/.0056 pair at plate of OD2
5)MV wiper to PA in jack
6)MV to OD relay common

Too many? Too few? How about OD level wiper to OD relay? (I dunno in Gil's amp)

Thanks in advance for everything

Dan

[Bob-I]

Too much. I start with NONE then add as needed. The Peavey transplant has none at all and is quiet as a mouse. The 3 channel has it on the input grids only on the first stages. I had much more in the 3 channel but removed it and it brought on much more high end. My little bitty Princeton transplant has only on the input and from master to PI.

I recently bought some of ApexJr's 20AWG teflon. It's easy to strip and really hard to melt. Excellent wire and I didn't notice any loss of highs when I put if on the input grid and 3rd stage grid (Plexi/Tweed style 3 gain stage amp).

[Icetech]

I only have shielded from the input jack to pin2 on all my amps... BTW, my amps are using 22awg teflon.. even the b+ on the preamp tubes.. been like 8 months, played a few times a week without issue:)

Has apex setup a online ordering yet? thats the only reason i havn't gotten from him before:(

[Bob-I]

I only have shielded from the input jack to pin2 on all my amps... BTW, my amps are using 22awg teflon.. even the b+ on the preamp tubes.. been like 8 months, played a few times a week without issue:)

22AWG has more than enough current handling for even the B+ on a 100 watter. I only use 20 because of my big clumsy hands.

Has apex setup a online ordering yet? thats the only reason i havn't gotten from him before:(

No but I e-mailed an order form and he called me for CC info. Not ideal but not that cumbersone either.

[skyboltone]

Too much. I start with NONE then add as needed. The Peavey transplant has none at all and is quiet as a mouse. The 3 channel has it on the input grids only on the first stages. I had much more in the 3 channel but removed it and it brought on much more high end. My little bitty Princeton transplant has only on the input and from master to PI.

I recently bought some of ApexJr's 20AWG teflon. It's easy to strip and really hard to melt. Excellent wire and I didn't notice any loss of highs when I put if on the input grid and 3rd stage grid (Plexi/Tweed style 3 gain stage amp).

Good idea. I'll rip all of it out except the first stage grids. Seemed kind of wild on http://s55.photobucket.com/albums/g159/ ... ?start=all that Ayan posted. Anyway, I will wire the filaments up this afternoon and plug it into the variac for a low voltage smoke test.

Thanks Guys
Dan

[Icetech]

Ill have to order from him next time...
And while i don't doubt the benefits of shielded cables, when i was having noise problem in a amp i ran all kindsa shielded and didnt seem to matter.. im a unpicky kinda guy though:)

[Darkbluemurder]

Seems I will have to do the same with my Guyatone D-clone. It has shielded wiring all over the place. It is quiet as a mouse though. It doesn't lack too much in the OD mode but the clean sound could use more sparkle.

[Tdale]

I'm just a few wires away from finishing my first Hybrid-A. I used shielded cable from input to 22K grid resistor, and that's all. But I'm wondering about using shielded cable from MV to effects send and from return and back to PI input. The reason is because the MV is on the front and the send/return pots are on the back, so the wires are pretty long...

What do you think? Should I use shileded wire for this?

By the way, my shielded cable has a pretty thin core..much thinner than the 18 or 22 gage I use elsewhere...but there isn't much current flowing these wires...right?

Tommy

[Bob-I]

I'm just a few wires away from finishing my first Hybrid-A. I used shielded cable from input to 22K grid resistor, and that's all. But I'm wondering about using shielded cable from MV to effects send and from return and back to PI input. The reason is because the MV is on the front and the send/return pots are on the back, so the wires are pretty long...

What do you think? Should I use shileded wire for this?

The answer is... try it, listen for attenuation on the highs and lower noise then make a decision.

By the way, my shielded cable has a pretty thin core..much thinner than the 18 or 22 gage I use elsewhere...but there isn't much current flowing these wires...right?

Tommy

Truth is we use wire far heavier than required everywhere. I've built entire amps with 22AWG and it's just fine. I use 20AWG now just because it's easier to make a good physical connection with it.

[drz400]

I'm just a few wires away from finishing my first Hybrid-A. I used shielded cable from input to 22K grid resistor, and that's all. But I'm wondering about using shielded cable from MV to effects send and from return and back to PI input. The reason is because the MV is on the front and the send/return pots are on the back, so the wires are pretty long...

What do you think? Should I use shileded wire for this?

By the way, my shielded cable has a pretty thin core..much thinner than the 18 or 22 gage I use elsewhere...but there isn't much current flowing these wires...right?

Tommy

Nice to use 18 or 20 on the heaters
I like 20 teflon, it is easy to work with and resolder.

On shielded coax like Teflon 20 there isnt much capacitance but remember it depends where you use it. If it is a low impedance drive go ahead since you wont loose anything. High impedance drive and you have to watch out. I'm going to take 1 foot of twisted 20 and compare that to 1 foot of 20 gauge coax in capacitance, that should be interesting