Voltages off

[ssssly]

So got the second amp together and a couple of the voltages are off.


T should be / actual
1 440 / 444

4 N/C

5 71 / 72

6 0 / 71.4

9  175 / 177

10  233 / 0

11  164 / 229

12  0 / 161

13  94 / 0

15  26 / 23

16  468 / 468

17  0 / 0

18  0 / 0

19  175 / 177

Four pin socket
A1  74.1 / 76.3

A2  428 / 439

A3  close to 0 / .48

A4  69.2 / 71.3

Nine pin socket
B1  3.1 VAC / 3.17

B2  4.1 / 4.1

B3  close to 0 / .002

B4  175 / 181.8

B5  0 / .002

B6  300 / 300.3

B7  0 / 0

B8  6.3 / 7.45

B9  3.1 VAC  / 3.1

T6, 10, 12, 13 are way off. Double and triple checked everything. And still get the same readings.

Any suggestions?

 

[Paul Joppa]

Terminals 6-10 look correct to me; I don't know why the manual still has those numbers. I thought that got fixed in the 3-15-2011 update but I guess not! Terminals 11-15 are part of the Zener string, and are meaningless once the shunt regulator tube kicks in. In both cases, the important voltages are those on the tube pins, and they are correct.

Hopefully PB or the good Doc will chime in sometime to confirm; he's built a few recently but I haven't seen the insides for a couple years. And, as usual, mine are prototypes and not reliably exact production models!

 

[ssssly]

Hmmm, maybe I got an old manual. The CD with that came with the kits was blank so Queen B sent me one via file share. Perhaps it was an older version before the updates.

The manual I have is labeled Paramount v1.1 (3/15/11).

Is there a newer version of the manual I should have?

 

[Paul Joppa]

You have the newest one I am aware of. I've put this change into the tracking system.

 

[ssssly]

Was actually a bunch of stuff different in the manual than was in the kit.

From little stuff like the tube sockets and transformers being different. To instructions to solder terminals that three steps later needed something else added to them.

On a side note. I see that the sr45 manual has moved been taken off the site. Is it still available? I was planning on building another sr45 but don't know what I did with the manual.

 

[bjorgens]

FWIW, in building my first paramount and checking voltages this evening, I had same results.  Glad this post was here to verify that all is actually ok!

Bryan