Tubes Asylum

7189As in Sherwood S5000, picture

71.218.144.31

PeterI

A

I live a charmed life. On the same week that I buy a Sherwood S5000 locally (but paid a premium price since it was pristine and unmolested), I go to the local once-a-year audio and electronics show and find 4 new-in-box 7189A tubes for it (old Realistic labels). I got them for pocket change.
Now I know that 7189A and 7189 are different but 7189A's can vary. These new (possibly E German) tubes have no connections on pins 1, 6, or 8, and the Sherwood S-5000 has no connections on those pins either. Studying the internal wiring, they should plug n play with no problem.
There is that chance they are just EL84s, with 7189A printing, but they have different pin connections than EL84s I have inspected. May be 6P14P EV.

Pete

Edits: 03/30/14

Follow Ups:

RE: 7189As in Sherwood S5000, picture - Michael Samra 16:23:38 03/30/14 (2)
Pete
The last couple pristine Sherwood S-5000s had gone for 800 dollars..Both S-5000s with the 7189 are Ultra Linear and properly rebuilt with make 23 to 24wpc.

Honest amplification is better than excessive 2nd order distortion anytime.
- RE: 7189As in Sherwood S5000. B+ ? - PeterI 18:57:10 03/30/14 (1)
  Hi Mike,
  I didnt pay that much. You mean they were original, unrestored S500o going for 800 clams?
  I recover some of my investment by selling the Telefunken tubes; I have no shortage of excellent 12AX7s.
  Say, what is optimal B+ voltage for these, measured right off the rectifier?
  Thanks
  Pete
  
  Edits: 03/30/14
  - RE: 7189As in Sherwood S5000. B+ ? - Michael Samra 22:18:07 03/30/14 (0)
    Yes unrestored
    The amp runs about 418 to 424 off the rectifier.
    
    Honest amplification is better than excessive 2nd order distortion anytime.
Those 7189A tubes... - Interstage Tranny 15:44:38 03/30/14 (2)
Cool tubes ! I have a set and can tell you these sound excellent. They run cooler than EL84s so they were made better than you think. They do look East Euro or Russian, but, who cares ?

Some day, you might luck out and find a quad of genuine Amperex or Mullard 7189 or 7189A tubes. Some folks crave the Telefunken 7189s. I prefer the Great Britain or Holland vintage 7189s. Still, I could definitely enjoy those gold pin Realistics... ENJOY !
- Thanks for the info. another picture - PeterI 16:50:51 03/30/14 (1)
  Does this picture, showing construction, make the manufacturer of these tubes clearer? Russian?
  7189A
  
  Edits: 03/30/14
  - Yep, Russian... - Steve O 17:18:44 03/30/14 (0)
    ...they be relabeled 6P14 (no suffix). Not as rugged as 6P14 EV/ER although some report they sound a little better. Since they're really pretty much 6BQ5s, best keep an eye on them
    in 7189 apps: they may not like it.

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