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TU-317 bulbs?

Alienz

Alienz

Super Member
Hi,
Found a TU-317 at the GW store today, 2 of the small bulbs for the signal strenght and tuning scale are out. Can't find a SM or schematic for it. Does anyone perhaps know what specs bulbs these are? Are they the same used as in the 417, 517 etc? Looks like the whole faceplate has to come off to reach them?

Thanks,
Gerard
 
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Just upgraded to TU 417,it seems the bulbs are same but very hard to source.Lucky mine had the handles with it...
 
Finally got the faceplate off, this is not gonna be an easy one. I cannot get the little pcb with the bulbs on disconnected from the faceplate, its all attached to the meters. I do not have a good camera atm to make some pics. Looks like the only way is to desolder those sockets.

The bulbs look a lot smaller than in your pics John so I'm still not sure what specs they have.

I think I'm gonne let the lighting rest for now and just enjoy listening to it for some time :music:
 
A while back, I could not find replacements for the original Stanley incandescent bulbs on a Sansui receiver so I ended up purchasing LED replacements on e-bay. They look very nice. Sometimes the sleeve (holder) of the bulb has the specs. You will need those in order to get the proper led bulb.
 
Vintagear said:
A while back, I could not find replacements for the original Stanley incandescent bulbs on a Sansui receiver so I ended up purchasing LED replacements on e-bay. They look very nice. Sometimes the sleeve (holder) of the bulb has the specs. You will need those in order to get the proper led bulb.
Click to expand...

Not sure if you mean the dial lights, I'm looking for the specs of the smaller bulbs illuminating the signal strength etc. I'm not a big fan of LEDs, tried it several times and tried all kinds of combinations of leds and resistors. In the end I always founf the light to be too harsh.

I did replace a dial light on a TA-500 receiver some time ago by cutting off the underside of the rubber socket (removed the bulb first ofc) and inserted a metal bulbholder that fit just nicely in there.
 
Just connected it to my main system in the living room, I must say it sounds a lot better than I expected, the stereo image seems to be wider than with my TU-666. Reception is bit noisy but that seems to be normal with this series. I might try some of these mods in future:

http://www.fmtunerinfo.com/DIY.html#TU-217
 
Alienz said:
Finally got the faceplate off, this is not gonna be an easy one. I cannot get the little pcb with the bulbs on disconnected from the faceplate, its all attached to the meters. I do not have a good camera atm to make some pics. Looks like the only way is to desolder those sockets.

The bulbs look a lot smaller than in your pics John so I'm still not sure what specs they have.

I think I'm gonne let the lighting rest for now and just enjoy listening to it for some time :music:
Click to expand...

Ah so the faceplate comes off? I just got a tu 317 and when I opened it up there are 4 screws, two slightly apart and on the right, two closer together. Is it those that have to be removed to take the faceplate off?

I've a horrible feeling this is going to be really awkward :sigh:

P.S. Did you get the bulbs out/fixed yet?
 
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I've just had a look inside and there's no way I'm going any further! There's a little square metal part with a screw hole in it that is now wedged in the top of the front of the panel above the channel knob. I can't free it and it is taunting me now. :sigh: I had to turn the case upside down to get the little fiddly screw out after I dropped it. I am going to send it away to be fixed.
 
Had almost the same problem, been a while since i worked on it but there were indeed 1 or 2 little metal plates that I could not figure out where they belonged, could not find them in the service manual either. But i think it was a SM for a 217, which is the same but without the lights and the noise filter. Still have not found a SM for the 317.

Still havent figured out how to replace those lights too.
 
Hi Gerard,

Just had a look at the TU-317 I have. The meter lamps can be removed by partially removing the front panel, or by desoldering the meter PCB. The lamps are mounted via a rubber holder that pushed on the two posts on the meter PCB. From what I have been able to ascertain, they meter lamps are 8V 150ma 4mm diameter wire ended -they are not specified in the service manual.

I removed the end lamp by loosening the front panel ad used long nose pliers to carefully remove the lamp.



some photos of the lamp/rubber holder - note they have a blue plastic sleeve fitted over the lamp



You could remove the meter board complete with the lamps from the bottom of the unit, just desolder the connections to the meters (circled)



the main dial illumination lamps can be replaced with 8V 250ma or 300ma wedge base lamps like these



Cheers

John
 
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Too much for me I'm afraid. I installed computer parts a few years ago which were easier than this by far. If I wore a hat I'd take it off to you guys who do this kinda work If I really tried I might have gotten somewhere but I don't know anything about radios and I don't want to do permanent damage. So it's getting sent off to be done.
 
Thanks for the great info and pics John! :thmbsp:

I was planning to use some 12v 40mA bulbs since i didnt know the voltage of them, thought 12v would suffice. The ones I had in mind are the very small 'threadlamps' we call them here.
Not much left of the blue sleeves and they are too big for the new lamps, maybe just use a blue marker on them?
 
I don't think that you will get much illumination from the 12V lamps. I might be ale to get something locally that would be a better match, let me investigate and get back to you.

Cheers

John
 
skippy124 said:
I don't think that you will get much illumination from the 12V lamps. I might be ale to get something locally that would be a better match, let me investigate and get back to you.

Cheers

John
Click to expand...

Thanks, i did wonder if would affect the brightness. I can get those same 40mA ones in a 8 volts version, I hope that will work but I have to order them. Or go the LED route but I'm not a big fan of that. At least thanks to your pics I now know how to get in there! :)
 
My 317 is fixed but the guy said the little blue sleeves over the signal and tuner lamps were cracked and unusable so they're off and the light will be different than on the two panel lamps (funny how there's only two panel but three meter lamps). I'm not bothered about any difference and hopefully it won't be too much difference. I tried finding a source of blue sleeves to fit but can't find any. I forgot to ask if the panel lamps had sleeves on them so they could be removed to even it up if so he may have done just that.
 
Wow, that’s the value of Audokarma, rack mounting a TU-317 that’s done duty in the workshop. The right hand tune meter lamp is not working so I got as far as desoldering and decided to do some investigation......came here on first search. Bingo...lamp spec and validation of process. Thank you again Sansui knowledge base.
Next Q; 8V 150ma 4mm wire ended, anyone have a possible source?
Cheers.
 
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