Minor Vintage Repair?

Blast from the past, I sold many of those back in the day working for University Stereo.

I don’t have first hand knowledge of the Tosh after so many years, but the illumination is usually provided by a minuture lamp embedded at the very top of the indicator and often covered by the bent metal piece the attaches the top of the indicator to the dial string.

I replace these with LEDs and typically replace all of the other dial lights with them at the same time. Best of luck. Great receiver!

@viridian Thanks. Do you know if these LEDs have to be soldered in? I can solder.....but its not pretty.

Sorry, I do not, as I don’t have a 2500 here to look at. There were various designs for those grain of rice bulbs, most do not require soldering. Once you get to it IMHO it will be clear (no pun intended).

Lots of discussions on MAC gear sites replacing the old little bulbs with LED.

@elizabeth What is an MAC site?

McIntosh gear.

I could not find a service manual for free on the net, but there are several paper service manuals for sale on the usual auction sites. It might be a good investment, and if you need more extensive work done it may save bench time if you supply it to your tech.

Good idea.Thanks. I have opened it once when most of the pots were not functioning properly. I used DeOxit solution on the pots and everything works great now except that one light. I won't have time to open it again for a few weeks but I'll look closely at that bulb and see if I can tell what it will take to replace it. The service manual would be handy.

Update: I opened the receiver up this evening. There are three bulbs burned out.

One rides in the pointer the other two are on either end of the dial face. They are all green. They are relatively easy to remove. 

They appear to be little wire lead bulbs. All three are green.

I purchased the service manual on eBay. It will be a few days before I get it. But, from the images I could see on eBay it looks like all three lamps are 14v 50ma bulbs. I will confirm this when the service manual arrives.

But, I've searched the web and cannot find 14v 50ma bulbs. I can find 35ma, 60ma, 70ma and 100ma.

Being an idiot when it comes to electricity I do not know if would be okay to use a bulb that isn't exactly 50ma. I don't care if it is a little less bright or slightly too bright. I just don't want to burn my house down....or have to replace bulbs every week.

It looks like these wire lead bulbs will have to be soldered in. The wires look too small to twist with the existing leads.

Take garden variety green LEDs and solder in series a 680 ohm 1/4 watt resistor to drop the current. Use a 560 ohm 1/4 watt resistor if you want a little brighter. 

Something like these?

https://www.parts-express.com/12-volt-warm-white-led-lead-lamp-for-marantz-sansui-kenwood-yamaha-son...

I don't solder well but I can do it.

I also don't know what 'in series' means.
Does that mean: source wire (positive or negative???)-->resistor-->bulb for each of the three bulbs?

No soldering required:

https://images-na.ssl-images-amazon.com/images/I/51n%2BNjAkilL._SL1000_.jpg

@imhififan The link shows a picture but doesn't say what those are. I'm assuming they are wire clips.

The parts express LEDs would probably be close enough. 

I think they would need a resistor as mentioned above to lower the voltage (or whatever) otherwise I think they would just fry.

The link shows a picture but doesn't say what those are. I'm assuming they are wire clips.

Those are spring wire connector.

https://www.amazon.com/uxcell-Connectors-Connector-Terminal-Barrier/dp/B07MXG2YM1/ref=sr_1_56_sspa?k...

Sorry for the late reply.

The current limiting resistor is needed on a plain LED because it will only handle 20mA at 2 volts.