Rick Stout's Pioneer Spec 4

For anybody who has worked on wire wrapped chassis, one of the main goals is not to disturb the wraps to the point where they break and have to be soldered. After breaking 3 on the left channel and 2 on the right on Chris'., I stopped and thought about it for a half a minute and turned the board 90 Degrees and isolate that brittle harness so no flexing is required to rework the amp board.
 

Attachments

  • 100_2660.jpg
    100_2660.jpg
    99.5 KB · Views: 61
  • 100_2659.jpg
    100_2659.jpg
    98.7 KB · Views: 70
laatsch55 said:
For anybody who has worked on wire wrapped chassis, one of the main goals is not to disturb the wraps to the point where they break and have to be soldered. After breaking 3 on the left channel and 2 on the right on Chris'., I stopped and thought about it for a half a minute and turned the board 90 Degrees and isolate that brittle harness so no flexing is required to rework the amp board.
Click to expand...

What guage is the wire that is wrapped?
 
Hows that 3300 and stable of 700B's treating you Doug??
 
fitz43 said:
Just fine, thanks. Does anyone make a amp switcher? I have a PL400 that needs exercising too.
Click to expand...

Doug, I've heard of some but can't recall any now. On the passive side there are the DBX 200 and 400 routers, line level stuff but they should work.
 
Amp boards done, on to the meter amp board.......
 

Attachments

  • 100_2663.jpg
    100_2663.jpg
    93.5 KB · Views: 61
  • 100_2664.jpg
    100_2664.jpg
    92.2 KB · Views: 63
  • 100_2665.jpg
    100_2665.jpg
    98.2 KB · Views: 59
Making Stout's Fat Spec lean and mean! :blackknight:
 
laatsch55 said:
Won't release relay to output jacks. Protection circuit is probably doing it's thing.
Click to expand...

We all know it will conform in due time, Herr Kommandant!
 
In due time are the key words there Steve, has been in previous sorties....
 
Meter amp board done......time to attack the grunge....
 

Attachments

  • 100_2667.jpg
    100_2667.jpg
    97.4 KB · Views: 51
  • 100_2666.jpg
    100_2666.jpg
    96.1 KB · Views: 44
Degrunged, big caps out, new caps going back in....
 

Attachments

  • 100_2668.jpg
    100_2668.jpg
    99.4 KB · Views: 54
Meter board done , amp back together, powers up great get my 3 clicks, Bias adjiust right in, offset on the left dials right in, right offset WILL NOT go below .415mvDC.
 

Attachments

  • 100_2708.jpg
    100_2708.jpg
    101.3 KB · Views: 52
  • 100_2707.jpg
    100_2707.jpg
    87.4 KB · Views: 50
That is never good when you cannot get the offset to settle in...
 
I can stand a little unsettling, it's the total lack of range needed to at least get it in the same galaxy....
 
Bad 47uf/100 volt cap on the power supply section of the protection circuit. Bad "New" cap, cause it was put in backwards , by me, dam,nit.
 
Everything steady as old rock now. Nice having two Spec 4's here. They keep each other honest, kinda, sorta, maybe....


Rick, you're getting a good one back..
 
You must log in or register to reply here.
Back
Top