Champzog Layout & Humdinger Questions

[ToneMerc]

Steve, excluding the rectifier, which runs of the 5V winding, you only have 2 tubes. IMO, you are over thinking, maybe even obsessing about heather wiring. Don't be so hard on yourself. Like I said before, it is hard to mess up a Champ. Old fashioned twisted pair will work very nicely here. You have two basic styles. One is up in the air, the other on the chassis "floor" in the corner created by the fold.

Phil is 100% correct here. Here's a JTM45 clone that I built with "floor" heater filament wiring. According to certain text this is plain wrong and will hum like all get out. Nevertheless, it's quite as a church mouse. Not everything that you will read in text is universal gospel.

Drop "those" books and pick up the soldering iron.

TM

[The New Steve H]

I will, once I come up with a complete Herzog schematic. I am working on filling the holes.

[diagrammatiks]

you gotta realize that the ac hum is going to be constrained against two variables in any segment of wiring...

1. the least hum that can be induced
2. and the most hum that can be induced

where you are in between those two variables depends entirely on a compromise between a number of different factors.

If you look at how the slo's tube sockets are arranged...

[img:863:540]http://www.aikenamps.com/SLO100.gif[/img]

the parallel lines are placed in the place with the least risk of inducing noise to nearby components.

twisting those pairs would greatly greatly increase the amount of surface area of the ac heaters, but without the benefit of chassis shielding in this instance.

you could also float the heaters like aiken does but you need to make sure you are a proper distance away from the pot casing or else your heaters end up running directly parallel to the pot elements.

[ampdoc1]

I'm sure some of the explanations here about why the "Soldano" method works well are probably based in fact. I wouldn't pretend to know, but I have used a similar (not raised above the sockets, and also connected to the preamp tubes) method in several amps, and had nary a problem with hum.

Also, it's just a very neat and easy way to hook up the heaters.

[The New Steve H]

I wouldn't pretend to know

You're supposed to pretend to know everything.

I think someone needs to read the FAQ.

[rp]

Also, it's just a very neat and easy way to hook up the heaters.

Liking the easy part, but looks scary to me, way too easy to short the heaters when probing around in there. Maybe there is teflon on the heater buses btwn the tubes that I can't see?

And a digression: Is Aiken using MO resistors throughout or are those some sort of fancy Japanese CFs or MFs?

[diagrammatiks]

Also, it's just a very neat and easy way to hook up the heaters.

Liking the easy part, but looks scary to me, way too easy to short the heaters when probing around in there. Maybe there is teflon on the heater buses btwn the tubes that I can't see?

And a digression: Is Aiken using MO resistors throughout or are those some sort of fancy Japanese CFs or MFs?

i forget if the production model has tubing on the heaters.

it's supposed to have tubing on all the other bare wires.

a lot of diy builds stick it...not that big of an issue though.

[diagrammatiks]

Also, it's just a very neat and easy way to hook up the heaters.

Liking the easy part, but looks scary to me, way too easy to short the heaters when probing around in there. Maybe there is teflon on the heater buses btwn the tubes that I can't see?

And a digression: Is Aiken using MO resistors throughout or are those some sort of fancy Japanese CFs or MFs?

i forget if the production model has tubing on the heaters.

it's supposed to have tubing on all the other bare wires.

a lot of diy builds stick it...not that big of an issue though.

I'm sure some of the explanations here about why the "Soldano" method works well are probably based in fact. I wouldn't pretend to know, but I have used a similar (not raised above the sockets, and also connected to the preamp tubes) method in several amps, and had nary a problem with hum.

Also, it's just a very neat and easy way to hook up the heaters.

you don't happen to sell those relay boards do you?

[ampdoc1]

I used to make and sell those boards, but don't have any remaining. I gave my PCB designs to Kurt Granger,. I believe he changed it just a little, and stocks them.

Curt Granger <curt@grangeramp.com>

[The New Steve H]

I got some good input on the Champzog.

On the power supply, I'm going to use four 8 uF caps, with two paralleled to make 16. I'll leave room to change it if I don't like it. I'm going to pretend it's a 5F1 and move things as necessary to turn it into a Herzog. Did the layout yesterday.

I'm omitting the 470 ohm resistor on the power supply; I am told it's there because the actual Herzog had a solid state rectifier, and I'm going tube.

I have to wonder if an EL34 would have been better than a 6V6, but it's too late to worry about that now.

This thing ought to throw itself together in a hurry now.