Time for a NEW challenge

Hyperion · Dec 12, 2014

vigman said:
Nope nothing that crafty when you can get THESE eBay item number:251589397179 temp knobs.. The Sansui Shop has some other needed bits.. While it's been RAINING IN So Cal ( OMG RUN FOR YOUR LIVES ). I rubbed out the right side panel, it will need a repaint.. but at least it's CLEANER, same with 1 bottom panel I have ( had to remove the DENT first ) but they both fit with no fuss and more YEECH removal It's like trying to way your car with Q tips~ . In between 4 AMBER ALERTS between 1:30 & 3:45am and 3 5 min power outages… Now THAT's NEWS !

Good find Mike ! - they look very good.

JOMARK911 · Dec 12, 2014

Yeah man they look very good. Are they screw secured like originals?

vigman · Dec 12, 2014

YEP set screw… So "Trouble in the MILL" Did an initial meter cal… The Right is OK...but the left channel can't make the 49 volts… only 37 and the feed from the input board is NOT the issue!

Time to look at the pre driver…… BAH

vigman · Dec 12, 2014

ODD Sansui paperwork R-20 ( on the print ) shows being an 82 ohm
BUT
Same in the other GOOD channel and they are both 27 ohms's

and here's the KICKER the parts list agrees with the stuffing!
THOUGHT I HAD YOU!!!
( SMH )

vigman · Dec 12, 2014

All resistors check out.. moving to diodes...

JOMARK911 · Dec 12, 2014

Woow man , that is way of . WTF?

vigman · Dec 12, 2014

BA-5K left driver board

VICTORY… but not 100% sure WHY.
BTW R17 is a 1.5K Not 1k as indicated on print
SO
There is all the work I did,
Swapped TR-04 for something CLOSER in HFE ( compared to others ) .
NEW TR-01
Replaced C-07
Pulled everything in green tested & returned if in spec and everything, besides TR-04 was within 2%

It was getting very VERY close to dog feeding time so I stopped.. tossed the board in … where I stopped and BADA BING It did 49 volts ( and then some )

Meters cal'ed… NEXT

Hyperion · Dec 12, 2014

I am really loving this thread Mike - kudos to you, great work. :tresbon:

vigman · Dec 12, 2014

"Projects " like this teach me ALOT.There are SO MANY issues is so many area's. It causes me to THINK on multiple levels.. Now I'm ( I think ) down to electronic NICE TO HAVES.... and moving to mechanical WOAH how am I going to deal with THAT...
PLUS people here offer help & parts to bring this ( and other ) beasts back from the junk yard.

vigman · Dec 13, 2014

Part of my WORLD DOMINATION PLAN

The KNIFE SWITCH OF ULTIMATE BIAS…
So the 5 K can start and not BLOW the 2A fuse in my fluke ...wiring to follow

vigman · Dec 13, 2014

It's ALIVE

So the knife switch acts as a start up shunt for the ~2.7 A start up current. new insulated alligator clips to tie on to the B+ feeding the finals and the return.
Then my meter hooks to the little ringlets at the switch… PLUS you can change side to side by just closing the shunt, move your meter. open the other side.
BADA BING.. WORKS LIKE A CHHAAAARM

vigman · Dec 13, 2014

Well didn't do much today... but I did score 4 feet, a speaker binding post and 1 knob...
From Nies @ the Sansui shop PLUS he is holding a 240/220/120/100 v power transformer for my Japan BA-3K!

vigman · Dec 16, 2014

Cocktail napkin drawing

I'm having some temp panels made, that look like this….

Overundr1 · Dec 17, 2014

You going to have a new faceplate milled?

vigman · Dec 17, 2014

I need to find a shop that will do that OR sand it ( using a mill will warp the panel ) ...Re anodize and fill
ALONG with making clean up cuts on the rack handels
But I'm fighting a cold and have been butt ass lazy

vigman · Dec 17, 2014

The "CHINA" knobs..... kinda of underwhelmed....

super98lsc · Dec 17, 2014

How bad was the faceplate?

vigman · Dec 17, 2014

China knobs… MEH~

Super you be the judge….

super98lsc · Dec 17, 2014

Yep that's rough. Had not seen it since you cleaned it up. Is it bent or mangled? Or just needs to be re-brushed and anodized?

canuckaudiog · Dec 17, 2014

That amp needs some big FAT knobs.

They don't look too bad but I can see why you might be a bit disappointed with them. Well, they work I guess. Nice work so far by the way!

Time for a NEW challenge

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On a quest for high fidelity

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