Spectro Acoustics model 500

[laatsch55]

James Burke dropped this off on his way through, serious distortion in one channel. In the scope it's missing the top half in the left channel. RCA 1B05 outputs, quasi comp, 89 volts rail voltage, I see some 2N5416, 2N3440's and the circuit looks familiar...

 

[Gepetto]

James Burke dropped this off on his way through, serious distortion in one channel. In the scope it's missing the top half in the left channel. RCA 1B05 outputs, quasi comp, 89 volts rail voltage, I see some 2N5416, 2N3440's and the circuit looks familiar...

I think you need to throw some pixie dust in there to get it working Lee...

 

[laatsch55]

I mean YEAH!!! If Tinkerbell put it together,,,,,THAT outta work!!

 

[premiumplus]

Is this the one, Lee?

 

[laatsch55]

Yep....

 

[premiumplus]

I'll take a shot at it. I like working on analog...waaay better than digital. Must have something to do with my 1952 pedigree...

 

[laatsch55]

You got it Dave...

 

[gadget73]

Looks like its missing a fuse on the Tinker Belle.




Whats with the text? I've never seen that sort of thing on a circuit board before.

 

[laatsch55]

Nicknames of the assemblers. Put together in Seattle in the 70's.........

 

[Gepetto]

Nicknames of the assemblers. Put together in Seattle in the 70's.........

Like far out man...

 

[laatsch55]

Far out, groovy and right on....

 

[fitz43]

Far out, groovy and right on....

My Spectro Acoustics came in a box which said Bellevue, Wa. I see somewhere else which says Richland, Wa.

http://k7iq.midnitesolar.com/spectro 500 test.pdf

Here's the story on Short Cakes and Tinker Bell from Robin. (can't recall his last name at the moment)

"


Re: Spectro Acoustics

« Reply #100 on: June 18, 2014, 01:01:31 AM »



"Short Cakes was a short cute blond lady names Suzie. She was bob's girl friend back then. Tinker Bell was a cute little red head. I rented a 23 foot camping trailer from her dad and lived in it.
For some reason we had a lot of very cute girls at Spectro?
Those Spectro transistors are actually MJ15024 transistors.
The 500SR is by far my favorite amplifier. I wish I had one!
The lights were very well done."

Doug

 

[laatsch55]

Robin Cudgel

 

[fitz43]

Robin Cudgel

Gudgel

http://www.hardysolar.com/inverter/inverter-history.html

 

[oldphaser]

Spectro Acoustics Model 500 On Ebay

It looks like James has the amp on ebay:

http://www.ebay.com/itm/Spectro-Aco...599648?hash=item36104b3aa0:g:n5gAAOSwmLlYAuBG

Ed