DIY Dodd Buffer

TrungT · « **Reply #680 on:** 7 Jan 2011, 05:09 am »

^^^^^

Welcome to Dodd bandwagon

About the charger: "plugged in, forget about it"

jtwrace · « **Reply #681 on:** 7 Jan 2011, 12:53 pm »

I'm not on the bandwagon I'm trying the sit next to Gary as the Pilot.

I have something in the works for the buffer...stay tuned.

jtsnead · « **Reply #682 on:** 7 Jan 2011, 02:21 pm »

Sounds exciting JT

Looks like Gary has something also, Stereophile's coverage
of the Rocky Mtn Audiofest mentions "hybrid mono amps"
in the room with GR Research. I think it willl be based on the
Classdamp boards. We will see soon I hope.

TrungT · « **Reply #683 on:** 8 Jan 2011, 01:22 am »

^^^^^
Dodd Hybrid Mono Amps at RMAF 2010 are Mosfet Hybrid.

sl_1800 · « **Reply #684 on:** 8 Jan 2011, 01:53 am »

Now I really want a pair of those amps.

gld · « **Reply #685 on:** 8 Jan 2011, 03:13 am »

JTWrace, just what you got?

Those amps are the new hybrid mono's. A single tube frontend with mosfet out put stage (Hitachi mosfets). Power supply consists of a 1KVA toroid with 136,000uf of filter cap with a stealth diode bridge. They are biased very hard into class A and run very hot!! They are 200@8ohms 350@4 ohms approximately 100 watts of it is pure class A!

Gary

jtwrace · « **Reply #686 on:** 8 Jan 2011, 03:16 am »

Quote from: gld on 8 Jan 2011, 03:13 am

JTWrace, just what you got?
Those amps are the new hybrid mono's. A single tube frontend with mosfet out put stage (Hitachi mosfets). Power supply consists of a 1KVA toroid with 136,000uf of filter cap with a stealth diode bridge. They are biased very hard into class A and run very hot!! They are 200@8ohms 350@4 ohms approximately 100 watts of it is pure class A!
Gary

cost?

gld · « **Reply #687 on:** 8 Jan 2011, 03:22 am »

I don't think this is the place to let the price of the amps known. They are very cheerful, but not really cheap!

Gary

jtwrace · « **Reply #688 on:** 8 Jan 2011, 12:03 pm »

Quote from: gld on 8 Jan 2011, 03:22 am

I don't think this is the place to let the price of the amps known. They are very cheerful, but not really cheap!
Gary

Gotcha! Let us know where post the new thread about them.

HAL · « **Reply #689 on:** 8 Jan 2011, 01:46 pm »

The Dodd hybrid monoblocks sounded really good with the Super-V's at RMAF2010!

jtwrace · « **Reply #690 on:** 9 Jan 2011, 01:28 am »

Quote from: gld on 8 Jan 2011, 03:13 am

JTWrace, just what you got?
Gary

I promise it will not disappoint. It will take the buffer to another level (as Danny likes to say). Which level? You will have to wait!

TrungT · « **Reply #691 on:** 9 Jan 2011, 01:46 am »

JT
You killing me here, I hate to wait.

Sometime, patient pay off.

hagar · « **Reply #692 on:** 9 Jan 2011, 09:44 am »

Hello all,
my name is Simon and searching for a preamp solution I came about this thread.
I wonder if anybody of you has compared the buffer preamp to one of the AVC or TVC
pres out there.
Until I saw the buffer this was the route I wanted to go.
Electronically I´m a total noob

,so do You think the Dodd buffer could de doable for a absolute beginner?
Getting an assembled one is finiancially out of reach at the moment.
I´d appreciate any comments
Simon

usp1 · « **Reply #693 on:** 9 Jan 2011, 04:52 pm »

Quote from: hagar on 9 Jan 2011, 09:44 am

Getting an assembled one is finiancially out of reach at the moment.
I´d appreciate any comments
Simon

You should email Gary Dodd to find out how much he would charge to assemble the kit. I don't think it is as expensive as you may be imagining.

Atlplasma · « **Reply #694 on:** 10 Jan 2011, 11:00 pm »

I have my buffer soldered and wired in a temporary layout until my enclosure arrives. I've only soldered in one set of inputs and outputs for the time being, but there is a problem.

When I apply power and set the selector, I can hear a relay click but no sound. The tube is not glowing either. I checked my wiring and found a couple of reverse wires between the selection and power switches. Correcting that error had no effect. I've checked the other connections and don't see any obvious (to me) errors.

Suggestions for troubleshooting this would be welcome.

gld · « **Reply #695 on:** 10 Jan 2011, 11:14 pm »

Atlplasma I have PM'd you.
Gary

sl_1800 · « **Reply #696 on:** 12 Jan 2011, 06:30 pm »

I completed the mod on my Dodd buffer for the change to a 6H30 tube. I attached the voltage regulator to a heatsink which I found in an old computer self powered subwoofer. To make room for the heatsink I moved the large potted module to the left as far as it can go. Due to the extra height of the new tube the tube socket module needs to be mounted on a "L" bracket so the tube is now horizontal. This job is not to difficult and the results are worth it, a very 3D soundstage, I was amazed. I had no idea this much difference could come from just changing a tube. I have included a few pics of what I did, maybe they will help someone.

jtwrace · « **Reply #697 on:** 12 Jan 2011, 06:32 pm »

Nice job!

Now get some bypass caps on that there buffer.

TrungT · « **Reply #698 on:** 12 Jan 2011, 08:02 pm »

Nice job SL_1800
6H30 does make the Dodd Buffer to the another level.

Add by-pass caps, will bring it up one more notch

praedet · « **Reply #699 on:** 12 Jan 2011, 08:07 pm »

Hmm, now you guys are forcing me to think about making the mods to mine!