STANDARD SR-4500 SOLID STATE RECEIVER

[nicolas25]

Hello anyone who has info about this vintage receiver? i need also schematics please. there is no voltage on the supply for the lamps. thanks

 

[Bone Yard]

Beautiful, from 1971, looks like their TOTL and expensive!

 

[nicolas25]

yes but i cant find info and schematics.lights are not working, no supply voltage

 

[Robisme]

I would:
look all over for a fuse.
Trace the lamp wire to where it gets power.
Make sure someone didn't put the wrong type of lamps in. (I have seen fuses in place of fuse style lamps)

Rob

 

[nicolas25]

i’ve thoroughly check the fuses, theres a 2 fuse underneath but its not for the lamps. i put 7 new lamps in total incluiding the vu's, all new, 8 volts but still not working

 

[KentTeffeteller]

You know these are not easy to find literature for. Standard Radio got bought out by SuperScope a year or so later, became Marantz Japan.

 

[nicolas25]

yes, maybe by miracle theres someone out there who got the schematics. it works well except the lights

 

[Bone Yard]

Standard Radio, before Marantz, is very hard to find, both physically and any literature.

You might want to include which country version you have and your skill level. For some, tracking down light power is easy, for others, not so much.

 

[nicolas25]

im from spain. i can say that i have a mid skill level

 

[Moving Ahead]

Is the balance slider in the middle under the large volume knob? In the advert it's far right...... maybe that's why we don't see too many of them?
Just to dismiss the obvious, have you switched the selector to radio?

 

[Bert Beukema]

I have one and did a revision. Sadly it's running too hot. Three trimpots per channel, I'd need the schematics or a service manual.

If anyone has them I'd gladly pay for then

Regards,

BB

 

[Moving Ahead]

Have a look at the trimmer values, the R value (may) give an indication as to their function.

 

[Bert Beukema]

Have a look at the trimmer values, the R value (may) give an indication as to their function.

Good suggestion.

But the board just has a VR designation. To measure the pots I would need to remove the power amplifier from the housing. Which is a lot of work sadly. And because it's all soldered wires it's easy to break them.

I'd rather not go down that road unless absolutely necessary.

I think a schematic would be necessary, best would be a service manual. Otherwise it will be like pissing in the dark.

Kind regards,

Bert

 

[Moving Ahead]

The trimmer should have numbers marking their value.
Something like 501, 102, 502, 103.....

like pissing in the dark

As long as you shoot away from your feet.

 

[Bert Beukema]

The trimmer should have numbers marking their value.
Something like 501, 102, 502, 103.....


As long as you shoot away from your feet.

You are correct, usually the trimpots will have some number for the ohms value. But these trimpots do not, they are not the regular scrappy trimmers.

Measuring them in circuit gives me wonky readings. I'd say best not play with them without a service manual.

Dann shame, it's a really good machine and sounds nice.

Kind regards,

Bert

 

[Moving Ahead]

Sadly it's running too hot. Three trimpots per channel

One trimmer is protection. Probably a 500 ohm. Likely followed by a diode.
One trimmer is bias , likely a 1K or such.
One trimmer is center voltage, likely a 10K/20K or such.

The bias and center voltage is simple and in fact you check the settings with a DMM - no need to adjust trimmer (unless there is a misalignment.)

Hope this helps