diytube.com

Posted: **Sat Aug 04, 2012 9:18 am**

In the Beginning....

There was the Rev - ST35 board.

Very similar to the Rev B, other than it did not have the 10 ohm cathode current measuring resistors.
My method was to simply adjust the "bias" pots so that the EL84 cathode socket pins (pin3) measured at
400 to 430 ohms relative to power/signal ground, andjust go with that.

There are not too many of these green boards in existence, I figured that it was time to share the pic.

/ed B

Posted: **Sat Aug 04, 2012 11:36 am**

I love those Nichicon power supply caps: 105C rated and low ESR. I think ten years ago I won an eBay auction of around 700 of those caps for $50. I still have a lot of them. (lol)

Shannon

Posted: **Sat Aug 04, 2012 4:44 pm**

I still have a "boatload" of those Nichicon caps and CL-50s that you sent me years ago.

Then I found more , as well as a large qtyof 180 uF/500V caps, and other goodies at an NH "antique" (read that as "junque" or "thrift" shop.

/ed

Posted: **Sat Aug 04, 2012 8:01 pm**

EWBrown wrote:My method was to simply adjust the "bias" pots so that the EL84 cathode socket pins (pin3) measured at
400 to 430 ohms relative to power/signal ground, andjust go with that.
/ed B

Ed... So casual back then....

(lol)

20

Posted: **Mon Aug 06, 2012 7:04 am**

They're just tubes, not NASA JPL Mars Rovers, fanatical precision isn't required

Curiosity has Landed! I wonder if it will find any evidence of ancient Martian tube technology

/ed B

Posted: **Mon Aug 06, 2012 7:37 am**

EWBrown wrote:
Curiosity has Landed! I wonder if it will find any evidence of ancient Martian tube technology
/ed B

What I want to know is where the heck is Friday?

That group hug at JPL went on a l-i-t-t-l-e too long this morning....

20

diytube.com

Before the blue boards, there was the green board

Before the blue boards, there was the green board

Re: Before the blue boards, there was the green board