6.3v indirectly heater valve PCB (possible group buy?)

[Ray P]

Andrew, I am considering a project with a pair of 6H30s to warm up and I two of these heater supplies available.

6H30 filaments are 6.3V @ 1.65A or 12.6V @ 0.825A; I guess that's asking a bit too much of these supplies?

Thanks

Ray

[Andrew]

Hi Ray,

One per valve should be fine.

Andrew

[Ray P]

Thanks Andrew, will life be easier for the supplies at 6.3 or 12.6V. I think 12.6 would be best; if so can you advise on the required voltage setting R values.

Ray

[Andrew]

Hey Ray,

Try the notes, should all be in there, if not let me know.

http://www.audio-talk.co.uk/phpBB3/view ... =19&t=4964

Andrew

[Ray P]

Hey Ray,

Try the notes, should all be in there, if not let me know.

http://www.audio-talk.co.uk/phpBB3/view ... =19&t=4964

Andrew

You're right Andrew, I had forgotten about them.

Cheers.

Ray

[Ray P]

Andrew, I think there may be an error in the Stacks section info for this project?

I'm planning on using one of these supplies at 12.6V to supply two 6.3V filaments in series. The Stacks info says;

For 12.6v operation, if you have the kit, you need to up-rate the input cap to something like 6800uF @ 25v, watch out for the part's diameter. A 25mm diameter cap is a very tight squeeze and obtaining a 10,000uF at 25v at 22m is quite a challenge, however 6800uF 25v 22mm is fine. R5 + R6 should be 1.2k + 56R (ish). At a minimum a 12v AC TX should be fine.

Assuming R5 is always 120R, I think it should read 'R6 + R7 should be 1.2K + 56R (ish)''?

Ray

[Dave the bass]

..also...caps sized 10,000uF but approx 22 meters in length or height are pretty hard to come by too! The local postman is not going to be happy I can tell.

[Andrew]

Thanks for the feedback guys, I have fixed the Stack's post.

cheers,

Andrew