Photo Gallery

[6A3sUMMER]

Four 6CK4 Triodes in Uk.
88 Pounds (no pound symbol on my keyboard). Parallel Single Ended in Stereo.
6.3V @ 5 Amps total, AC on filaments works great!

Four 2A3 Triodes in UK.
How many Pounds ($) ?
And, then you have to supply 2.5V DC, 10 Amps total.
If you want to use individual fixed adjustable bias, OK.
Or, If you want to use Individual self bias, you need Four each 2.5V DC @ 2.5A.
Complicated.

Or see if you can get two 6BX7 dual triodes or two 6BL7 dual triodes in UK for Parallel Single Ended in Stereo (6.3V @ 6 Amps total).

 

[qiuchun63]

很不错的介绍。你在用什么软件？

SOLIDWORKS

 

[qiuchun63]

SOLIDWORKS

 

[jcalvarez]

Four 6CK4 Triodes in Uk.
88 Pounds (no pound symbol on my keyboard). Parallel Single Ended in Stereo.
6.3V @ 5 Amps total, AC on filaments works great!

Four 2A3 Triodes in UK.
How many Pounds ($) ?
And, then you have to supply 2.5V DC, 10 Amps total.
If you want to use individual fixed adjustable bias, OK.
Or, If you want to use Individual self bias, you need Four each 2.5V DC @ 2.5A.
Complicated.

Or see if you can get two 6BX7 dual triodes or two 6BL7 dual triodes in UK for Parallel Single Ended in Stereo (6.3V @ 6 Amps total).

You can use "GBP" instead of "£" 🙂
£88 is almost decent-output-transformer territory. No way Jose.
2A3->DHT, IMHO definitely not worth the complications, as you rightly pointed out.

Very interesting the 6BX7 and especially 6BL7, thank you for the advice. The 6BL7 is sensibly priced, but a bit annoying that most sellers just have 1 item available. I may buy a couple from ebay.

The reason I'm reluctant to spend too much money is that:
1) I already have 4 6N6Ps. The simulation shows decent results.
2) I'm cheap, living in Scotland for 20+ years, picked some of the good Scottish customs 🙂

But seriously, I will probably give the 6BL7 a try. It's like a souped-up 6SN7, should be easy to use.

 

[drteming]

Little SEUL amp. I used all Soviet tubes. 6J32P(EF86) triode strapped, 6P14P-EV (EL84) SEUL, 5C4S (5Z4) rectifier, SG1P-EV (0A2) VR tubes.

9" X 7" X 2" Hammond aluminum chassis.

Naughty bits, overall:

Left Channel:

Right channel:

Voltage regulation for the driver tubes:

Power supply:

Volume pot wiring:

That is all.

 

[gideon1990]

Is that a mosfet hiding between the VR tubes? looks great!

 

[drteming]

Is that a mosfet hiding between the VR tubes? looks great!

Hee, hee. A little silicon poisoning won't hurt anybody. It's a source follower using the VR tubes as a reference voltage to the gate.

 

[qiuchun63]

Very nice presentation. What software are you using?

The software used is solidworks..

 

[qiuchun63]

The 845 electronic pipe power amplifier production process,(1).

 

[qiuchun63]

The 845 electronic pipe power amplifier production process,(2).

 

[qiuchun63]

The 845 electronic pipe power amplifier production process,(3).

 

[qiuchun63]

The 845 electronic pipe power amplifier production process,(4).

 

[qiuchun63]

The 845 electronic pipe power amplifier production process,(5).

 

[6A3sUMMER]

drteming,

That is a very nice amplifier. Cute. Nicely executed.

What UL output transformers did you use?
Manufacturer; Primary impedance, Percent of the UL tap?

Happy Listening!

 

[drteming]

drteming,

That is a very nice amplifier. Cute. Nicely executed.

What UL output transformers did you use?
Manufacturer; Primary impedance, Percent of the UL tap?

Happy Listening!

The OTs are from Musical Power Supplies with custom 24% UL tap. 5k primary impedance.

 

[jcalvarez]

Little SEUL amp. I used all Soviet tubes. 6J32P(EF86) triode strapped, 6P14P-EV (EL84) SEUL, 5C4S (5Z4) rectifier, SG1P-EV (0A2) VR tubes.

9" X 7" X 2" Hammond aluminum chassis.

View attachment 1007644

View attachment 1007645

Naughty bits, overall:

View attachment 1007646

Left Channel:

View attachment 1007647

Right channel:

View attachment 1007648

Voltage regulation for the driver tubes:

View attachment 1007649

Power supply:

View attachment 1007650

Volume pot wiring:

View attachment 1007651

That is all.

Very good looking and tidy amp, well done!

 

[qiuchun63]

drteming,

That is a very nice amplifier. Cute. Nicely executed.

What UL output transformers did you use?
Manufacturer; Primary impedance, Percent of the UL tap?

Happy Listening!

The output transformer I use is 7K.It is my own design.

 

[kodabmx]

The new preamp - no hum on phono finally!

I'm just waiting for a circuit board I designed for 6E2 meters to get here and then those holes won't look so empty anymore.

There's also a tape monitor function but I'm waiting for the button.

 

[jcalvarez]

I envy that rack, have seen it in several pics from you, looks great!

 

[drteming]

Variation on a theme, the second of my holiday projects. Not as compact and cute as the first one, but it allowed me to use a larger choke and capacitors (bigger=better?). This amp came about from tinkering with the 6JC5 tube in my 6AV5 amp, and the 6J7 driver for my 6BG6 amp. I don't see the 5879 tube used much around these parts, probably because of the low Gm, but I played with it a while back when I built a Gibson GA-40 clone and liked it a lot. People like to call it the American version of the EF86, but it looks like a miniaturized 6J7, but slightly wimpier. It's driving a beefed up 6V6 which one can do with a slightly undercooked potato. Onward to the pictures.

Overall:

I apologize for the blue LEDs under the driver tubes, but there was no good place for a power indicator light that would preserve the symmetry. Stuffing the LEDs up the tail of the 5879s was the easiest way. There was no blue glow in the 6JC5 tubes. I checked before I stuck in the LEDs.

Guts:

Left channel:

Right channel:

Volume pot and voltage regulator:

Power supply:

This temporarily concludes my vacuum tube endeavors.