DIY Dodd Buffer

ltr317 · « **Reply #580 on:** 16 Nov 2010, 10:51 pm »

Quote from: Mariusz on 16 Nov 2010, 07:09 pm

I believe it's called Vacuum Mummification. Easily extends tube life to thousands of years.

Actually, if it's teflon or plumber's tape, it will shorten tube life, as it will not get proper heat dissipation.

Mariusz · « **Reply #581 on:** 17 Nov 2010, 01:14 am »

Quote from: ltr317 on 16 Nov 2010, 10:51 pm

Actually, if it's teflon or plumber's tape, it will shorten tube life, as it will not get proper heat dissipation.

Hey Paul
What if say, Teflon tape (plumbers tape) is used only at the bottom or top part of the tube? Would that be acceptable proposal for inexpensive "tube dumpping tweak"???

Question is a bit off topic but interesting nevertheless.

M.

ltr317 · « **Reply #582 on:** 17 Nov 2010, 01:33 am »

Quote from: Mariusz on 17 Nov 2010, 01:14 am

Hey Paul
What if say, Teflon tape (plumbers tape) is used only at the bottom or top part of the tube? Would that be acceptable proposal for inexpensive "tube dumpping tweak"???

Question is a bit off topic but interesting nevertheless.

M.

Hi Mariusz,

Well, you would have to wrap the tape many times around the tube in a small area to allow heat dissipation. But why would you want to do that? You can buy cheap tube dampers that will do the same thing. Don't forget, dampers are to help with microphonic tubes, not noisy tubes. Nothing helps with noisy tubes, except once in a while you get lucky if you thoroughly clean the pins. From my long experience, that only works about 5% of the time, and I may be generous with the percentage.

G.Michael · « **Reply #583 on:** 17 Nov 2010, 04:01 pm »

Hi Trung,

Questions:
--What does the teflon tape do for the sonics?
--The big heat sink, what heat is that dissipating? It doesn't look as though it's doing much to help the tube.
--It that a toggle switch next to the bottom corner of the heat sink? What's that do?

TrungT · « **Reply #584 on:** 19 Nov 2010, 07:38 am »

Michael
Teflon tape act just like the tube damper. (I don't have to buy tube damper and I'm cheap

, I have few feet of Teflon tape here already)
If you worry about heat, just wrap one line, since the tube I using does not put out much heat anyway. How does it sound, try it and find out

, if you don't like it, just take it off.

Big heatsink is for the 6V voltage regulator, when 6H30 tube is in use, it does draw more amp than stock tube, so more heat, bigger heatsink (may be little over kill on my buffer)
Toggle switch, just switch 12V or 6V , you can use 12V or 6V tube on the buffer.
Hope that help.

praedet · « **Reply #585 on:** 19 Nov 2010, 06:12 pm »

Well, here is my finished power source for the buffer. I think I am going to get a 2nd buffer as I want one with a HT bypass

dBe · « **Reply #586 on:** 19 Nov 2010, 06:50 pm »

Quote from: praedet on 19 Nov 2010, 06:12 pm

Well, here is my finished power source for the buffer. I think I am going to get a 2nd buffer as I want one with a HT bypass

AWESOME!!!

Good job.

Dave

TrungT · « **Reply #587 on:** 20 Nov 2010, 03:54 am »

Praedet
Awesome.

Here another Dodd buffer build:

Solidworks for the drawing.
Chassis from here http://www.circuitspecialists.com/prod.itml/icOid/6051

more soon

Mariusz · « **Reply #588 on:** 20 Nov 2010, 04:08 am »

Hey Trung
I was going to ask: where did you get that metal case?
And what dimensions is it? (looks close to 8x12x3 ?)

I'll post some pics soon as well. Heat sink, knobs, polyurethane on faceplate should be done this weekend..............ofcause, I wouldn't accomplished a thing without your help and advice.

TrungT · « **Reply #589 on:** 20 Nov 2010, 04:13 am »

Mariusz
You'r welcome

http://www.circuitspecialists.com/prod.itml/icOid/6051
11.9''(L)x7.5''(W)x2.9''(H)

Mariusz · « **Reply #590 on:** 20 Nov 2010, 04:50 am »

Great link Trung.
Found few things which are just perfect for other projects.
Thanks again.

TrungT · « **Reply #591 on:** 20 Nov 2010, 08:22 pm »

More to come .....

HAL · « **Reply #592 on:** 20 Nov 2010, 08:56 pm »

Trung,
Looks very nice!

I think I have an idea of how to get the BIG heatsink in the standard chassis and not move things to much. Will see if I can find some tall stand-offs for the four corner holes! Then is should sit above the big power module and have cooling around the bottom and top.

TrungT · « **Reply #593 on:** 20 Nov 2010, 09:10 pm »

Hal
Great ideal, look much nicer than those cable tie.

May have to "re-mod" my heatsink.

TrungT · « **Reply #594 on:** 21 Nov 2010, 01:45 am »

Mariusz · « **Reply #595 on:** 21 Nov 2010, 02:57 am »

Your teflon tweak inspired me a bit and since it is a slow night at work and not much happening in collage football, here is another idea:

nodiak · « **Reply #596 on:** 21 Nov 2010, 03:33 am »

"and not much happening in collage football"
Arkansas vs Mississippi State is a good one!

But braiding teflon tape for tube dampers is diy heroic man!

TrungT · « **Reply #597 on:** 21 Nov 2010, 03:40 am »

Mariusz

Mariusz · « **Reply #598 on:** 21 Nov 2010, 03:50 am »

Quote from: nodiak on 21 Nov 2010, 03:33 am

"and not much happening in collage football"
Arkansas vs Mississippi State is a good one!
But braiding teflon tape for tube dampers is diy heroic man!

I was watching ND v.s Army.
Nebraska v.s Texas looks promising tho.
And that's not an act of desperation but boredom.

TrungT · « **Reply #599 on:** 21 Nov 2010, 05:43 pm »