diytube.com

Part 1: http://www.enjoythemusic.com/magazine/e ... vinson.htm

Part 2: http://www.enjoythemusic.com/magazine/e ... vinson.htm












/ed B

Cuties!

Now to replace that Hammond with some GXSE and away we go

(This post was NOT paid for by the Weston family )

I have tried that one out once. Couldn't get the hum out and found it annoying to drop 150V and some milliamps.
However I think I have found some other schematics using the 12B4A.

This one is coming from Holland (and most propably from diyaudioprojectsforum. It could have been specially made for a friend in Holland:
http://www.pastisch.se/HF/12B4A%20amp.jpg

LED-bias for the driver tube:
http://www.pastisch.se/HF/12b4a_LED_SE.jpg

From Chian or Japan??:
http://www.pastisch.se/HF/5965dc12B4.jpg

Points for using a triode strapped 6AU6! It's a terrible shame that no one makes a new supply for the 12B4, or I'd try to produce a commercial headphone amp with them.

Shannon

Shannon Parks wrote:It's a terrible shame that no one makes a new supply for the 12B4, or I'd try to produce a commercial headphone amp with them.

Indeed!

Doesn't a triode strapped 6P43P-E or something come close?

Geek wrote:

Shannon Parks wrote:It's a terrible shame that no one makes a new supply for the 12B4, or I'd try to produce a commercial headphone amp with them.

Indeed!

Doesn't a triode strapped 6P43P-E or something come close?

By Jove, Geek! That tube wasn't on my radar, but it sure looks like a 12B4-type: http://www.klausmobile.narod.ru/testerf ... clones.htm



The curves look almost identical, with great low voltage perveance characteristics. I'll buy some of these for sure. Thanks for the heads up!

Shannon

It would kick butt in a line stage

http://geek.scorpiorising.ca/GeeK_ZonE/ ... pic=4156.0

*edit*

A caveat with these is they LOVE to become V/UHF transmitters Snub wisely.
(playing with one on the breadboard, it broke the squelch on a 470 MHz FRS radio I forgot I left on)

Geek wrote:It would kick butt in a line stage

http://geek.scorpiorising.ca/GeeK_ZonE/ ... pic=4156.0

Good stuff! Ahead of the "curve" as usual.

Shannon

"What the hell am I going to use a 1.5 watt amplifier for?" Guitar amp?

$149 VT-1 1W guitar amp.
http://wangs-amps-usa.myshopify.com/pro ... -amplifier

If you put a gain pot before the 12B4A output tube, it should sound better than a pedestrian12ax7?

Some years ago I was very much into STC type of amps (Google Super Triod Connections) and even built twwo amps based on ECL82/6BM8.
There as one site where there were a huge number of designs using various kinds of tubes and one of the designs used a 12B4A together with 12AT7 and a 6AS6. Maybe I should look into this design again as I have transformers and tubes (should still have some 12B4A left).

kheper wrote:"What the hell am I going to use a 1.5 watt amplifier for?" Guitar amp?

$149 VT-1 1W guitar amp.
http://wangs-amps-usa.myshopify.com/pro ... -amplifier

If he wants to sell that as a guitar amp, it's already accompanied by the hashtag of "FAIL" - look at all the HiFi components and HiFi thinking gone into it

Geek wrote:

kheper wrote:"What the hell am I going to use a 1.5 watt amplifier for?" Guitar amp?

$149 VT-1 1W guitar amp.
http://wangs-amps-usa.myshopify.com/pro ... -amplifier

If he wants to sell that as a guitar amp, it's already accompanied by the hashtag of "FAIL" - look at all the HiFi components and HiFi thinking gone into it

I think I meant that the 12B4A (as the output tube) might make for a better sounding guitar amp than the 12ax7 - with the necessary changes made to his circuit - no stereo, no Hi-Fi components, etc. That puny Wang Amp is popular.