scroe?

quaddriver

quaddriver

120 What?'s per channel
Subscriber
today, from craigslist, 20 units, $200. all work, all in good shape except a SX-550 which is just a shell (faceplace and case)

A gpx monolith is in there (river) and a 'electrophonic' which looks like a truetone I have (river), got 2 all in 1's, a couple receivers with 8 tracks in them (believe it or not, I got a nest of 8 track guys in tionesta PA). but there are
8 units in there from 10-100 watts that are attractive and will undergo a restore. just peeking once I unloaded, the kenwood KR710 is a real sweetie.
 
Register to hide this ad
How rude of me. Its gonna take weeks to get it all across the bench, especially since I start the next phase of the house remod, but here is the Kenwood KR710 (works, pretty, one nick in the rear top of 1 wooden side) and a JVC AX-R87 Amp - also works
 

Attachments

  • IMG_20180312_104931.jpg
    IMG_20180312_104931.jpg
    64.5 KB · Views: 232
Are you saying that there are 20 units (receivers, amps, various sources, etc)... all for $200???

I'd be all over that as a reseller.
 
yes, there were 20 things, be it an amp, a turntable(3), tape deck (2 are silver classics!) and stereos from receiver to all in ones.
 
And now, for something completely different (to most):

early 70's BSR-McDonald 40A. worked, but had major fleas (attenuated channel, bad hum, bad swish)

total go over and a ton replaced. IT was loaded, phono amp, tone amp and main driver board with 2SC458's...replaced with KSC1845s matched left to right.

all caps changed. (ok, I left 3 on the tuner). many diodes. the drivers were an old silicon TO-1 in a heatsink, I replaced with KSC2383 and made the same sink fit.

The hum was bad caps in the power supply, local filter on the driver, and the output caps.

The swish was noisy 458's

The attenuation was bad components on the phone preamp board...apparently everything except tape in, visits the board for some reason.

I dont have the manual from rick - yet - its coming - but I got her working. Its so similar to other units including a concord CR100 inside, was easy to decipher.

From waht I gather this is 50 watts IHF, so I figure about 25rms. IT has to220 heatsinked outputs and adult power supplies. 4 FM IF sections, 2 or 3 (forget) AM ones. really good tuner.
IMG_20180315_140320.jpg
 
found out the bsr (got the manual from rick) is 50watts TOTAL, 25IHF so more like 10-15 RMS

did a panny se2709 and a philco all in one that has the ever important ford emblem on it, making it quite collectible!

IMG_20180322_143150.jpg
(like the marantz blue touch?)

IMG_20180327_154231.jpg

(I idiotically took the pic before the knobs were back on, but you get the point.)
 
Awesome of you to save them from the land fill. I imagine there will be some happy new owners in the future.
 
well my 8 track guys should be happy, and the philco/ford - heck I can sell that at the car show cuz it does say ford - they can be fanatical! low fi fer sure, but they work and they reflect a better time. Im getting all this low hanging fruit done so I can move onto the big guys
 
quaddriver said:
well my 8 track guys should be happy, and the philco/ford - heck I can sell that at the car show cuz it does say ford - they can be fanatical! low fi fer sure, but they work and they reflect a better time. Im getting all this low hanging fruit done so I can move onto the big guys
Click to expand...

Very curious how this will work out for you. I did a group buy one time and bought a ton of $40 each vintage pieces. There were some gems but a lot of them turned out to be door stops. Barely made my money back but definitely not worth my time.
 
anything 8 track, and all in ones that have a turntable - even ceramic, always sell. Im into these for $10 each, plus a small amount of parts - like trans, caps, res etc.

I know a lot of people would like a store of sx-780 class machines wall to wall, but that just does not happen. you gotta literally have - 5-100 watts on tap
 
All in 1's are great for small grandkids (6-10). After that they start wanting the good stuff. So when they turn 10 they get components. and i get the all in one's (klh-20's) back.
 
quaddriver said:
And now, for something completely different (to most):

early 70's BSR-McDonald 40A. worked, but had major fleas (attenuated channel, bad hum, bad swish)

total go over and a ton replaced. IT was loaded, phono amp, tone amp and main driver board with 2SC458's...replaced with KSC1845s matched left to right.

all caps changed. (ok, I left 3 on the tuner). many diodes. the drivers were an old silicon TO-1 in a heatsink, I replaced with KSC2383 and made the same sink fit.

The hum was bad caps in the power supply, local filter on the driver, and the output caps.

The swish was noisy 458's

The attenuation was bad components on the phone preamp board...apparently everything except tape in, visits the board for some reason.

I dont have the manual from rick - yet - its coming - but I got her working. Its so similar to other units including a concord CR100 inside, was easy to decipher.

From waht I gather this is 50 watts IHF, so I figure about 25rms. IT has to220 heatsinked outputs and adult power supplies. 4 FM IF sections, 2 or 3 (forget) AM ones. really good tuner.
View attachment 1138162
Click to expand...


Hi Quaddriver, I too just recently picked up one of these - Is and oddball little receiver. Found the RCAs for main speakers and screw terminals for the remotes a bit unusual, wonder what the thinking was. Anyway, it seems my little guy is exhibiting similar problems to yours and was hoping you could imaprt some sage advise on troubleshooting since you appaer to have done some intimate dancing with yours. First up, I'm no technician but can use my MM enough to be dangerous(and I do know how to solder).

These are the symptoms:

The left channel is very low but is audible with the balance knob all the way to the left, when you turn to the right the right channel overpowers it and that is all you here, definite bias to the right. This occurs on FM and Aux using both main and remote speakers. There is also a very noticeable hum, with the addition of some intermittent "popping" when in Aux.

I have cleaned(thoroughly) all the pots - the offset at the speakers measure 49mv, I also id an in circuit check of the output transistors and they show 255ohms.

So reading you post, it looks like I should start with the caps - I did notice some whitish residue around the 100uf cps on the main board - don't know if this is glue or leakage. May take is replacing caps should possibly resolve the hum issue - the big 1000uf caps don't appear to be bad. The problem with the L/R balance issue, if I read your post correctly, is with the pre-amp, so if the being the case, what would need to be checked/replaced.

I have a manual for the 40 model which is the 17 watt version of this receiver that I downloaded from hifiengine - the layout is virtually identical and expect a lot of the components are the same. Any help would be appreciated

Thanks
 
i had replaced the transistors that made up the inputs and REALLY went over the solder joints as the traces lift from the board. also, the .1-1up caps on the amp inputs need replaced
 
quaddriver said:
i had replaced the transistors that made up the inputs and REALLY went over the solder joints as the traces lift from the board. also, the .1-1up caps on the amp inputs need replaced
Click to expand...

Thanks - I'll start with the caps and traces and see where that takes me- I'll try and tackle the transistors if need be(they are pretty small and my eyesight and dexterity are not what the used to be) I think the biggest issue will be getting to the backside of the boards, wires are packed pretty tight, hopefully can get at them withput having to desolder anything. I havene't heard the term 1up capacitor, is that just referring to any above a certain value?
 
You must log in or register to reply here.
Back
Top Bottom