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[Burnedfingers]

Miles


You just had to tease me with a 807 amplifier. I have been gathering parts for one and now after seeing yours I will have to make one.

I'll bet it sounds sweet.

 

[Miles Prower]

Miles


You just had to tease me with a 807 amplifier. I have been gathering parts for one and now after seeing yours I will have to make one.

I'll bet it sounds sweet.

Yuppers, sounded very fine even before connecting the NFB, and it doesn't require very much of that. Even though 807s are officially an "xmtr" VT, they are outstanding performers for audio as well.

"I will have to make one." Hop to it!

 

[SY]

My latest effort, crafted from specially selected alloys chosen after hundreds of hours of listening tests. The precision machining took over 1,000 hours and was done by specially trained craftsmen. No expense was spared in the selection and qualification of components. This is truly what high end audio is all about.

 

[leadbelly]

My latest effort, crafted from specially selected alloys chosen after hundreds of hours of listening tests. The precision machining took over 1,000 hours and was done by specially trained craftsmen. No expense was spared in the selection and qualification of components. This is truly what high end audio is all about.

Ah, your LED-cathode-bias EL84 amp? Hmmm, I'm gonna do the same thing but hide the LED's inside

 

[poobah]

SY,

The faux rust work is EXCELLENT... as are your efforts to get that antique patina... very nice

Do explain the LEDS, a CCS with 32 stage cascode, fast bass, or what?

 

[SY]

I like red.

 

[poobah]

crypticer and crypticer...

 

[Burnedfingers]

My congratulations SY

I think the bass might be better with blue LEDs

 

[Cal Weldon]

Aren't they supposed to be red and green for right and left channel?



EDIT: the boaters among us will understand

 

[SY]

All joking aside, the LEDs actually were quite carefully chosen. Low dynamic impedance is tough to find these days.

And I should credit pinkmouse for cleaning up my photo.

 

[rdf]

Low dynamic impedance is tough to find these days.

What do figure the dynamic impedance is at the current being run? A couple of nights ago I assembled a jig to test AC impedance of LEDs biased by a variable CCS and driven with a sound card. A rough calc suggests the lowest AC impedance LED in the junk box is about 7 ohms at 1000 Hz with 15 ma static DC bias. Are significantly lower to be had? BTW, thanks for the tip on LED biasing, much cheaper than Mills wirewound.

 

[SY]

The LEDs I use have an AC impedance of 4.5 ohms. Cheaper than a Mills, and no need for bypassing- gets that whomping electrolytic out of there. But I had to try at least a dozen varieties until I hit one this good.

7 ohms sounds like one of the better "super bright" red.

 

[rdf]

That's an accurate description of its appearance, small and bright. Unfortunately that's also the only information on them. I buy them in bags-o-LED packaging from the local jobber. Currently using one as cathode load for an Ultrapath 6c45 and it works very, very well.

 

[ruski]

This is my phono preamp in the first plane. He include tube ECC83. In the next location is phono amp, witch connection from preamp. He include in the first stage 2xE88CC and in the last stage include Russian tube 6H13C.

 

[ruski]

And this is my next construction. This is a tube amp witch I use when I need quietly play in my home (noice witch made this amp no irritate neighbours . The amp have a clean chanel like a Fender amp. In the first stage I use the ECC83. The next stage include EL84 witch create 4W power. The box this is a wine package.

 

[arnoldc]

My 12B4 preamp.

I salvaged an old data switch for parallel printers and built the 12B4 preamp into it.

Here's the front

An externally hosted image should be here but it was not working when we last tested it.

and he back

An externally hosted image should be here but it was not working when we last tested it.

 

[karma]

data switch nice

 

[ruski]

Two days ago I implementing a new transformers in my OTL. The transformers was made to order. But they isn't dedicate for 6H13C. The transformers was made for 6C33C-B, but this projec to be temporary stop, because i have't much time but soon realized him.

 

[Fuling]

My 6B4G DRD amp, soon to be finished.
Triode wired E81L inputs, LL1664 and LL1621 OPT and plate choke.
The amp is finished and the PSU will be in a couple of days.
Those big chokes at the bottom of the PSU are 25mH 3A double C-core surplus units for the LCLC filament supplys.

 

[Fuling]

The PSU: