[guest1632]

Hi,

Well, I am in the planning stages to build to some extent from scratch a GGP. Now, I am wondering if anyone has tried using a CCS circuit in place of the Minus 200V for the Filament side. If so, I'd like to know what resistor values to get. i think if memory serves me right, I could use a LM317 Regulator? for the CCS. That is all I know. Not sure how to implement this idea. Thanks for any help.

Also, as a side note, probably will use the Analog Metric PCB's. So if you have any suggestions as to placement of parts, like transformers, size of chassis,  ETC, probably should be a different thread here.

Ray Bronk

[jrebman]

Ray,

I'd honestly recommend just leaving it alone, especially if you don't know what you're doing.  You can easily ruin the sound (extreme distortion from overdriving the grids of the output tubes), not to mention the circuit board.

How about building it, giving it some time in the system and then figuring out if there is something that needs tweaking?

-- Jim

[guest1632]

Ray,

I'd honestly recommend just leaving it alone, especially if you don't know what you're doing.  You can easily ruin the sound (extreme distortion from overdriving the grids of the output tubes), not to mention the circuit board.

How about building it, giving it some time in the system and then figuring out if there is something that needs tweaking?

-- Jim

hi Jim,

I really wouldn't consider this a tweak, rather a slight design change. This is still in the planning stages, so this is why I am asking beforehand. Anywhere I can get rid of this Minus 200V, I am happy to do so. Plus, I am wondering what the differences in sound there will be.

As for building it, I will probably just do that. Build it, and see if there are any tweaks to do from there like diode replacements with faster "soft recovery" diodes.

The one item that interests me is that Analog Metric is using only one transformer with all three of the taps available versus TS using three transformers. is there some interaction in the windings of one transformer versus some isolation with three of them? If anyone's gotta comment, I'd like to know.

Ray Bronk