MR77 bulb replacement - using 1847 for 1866

[SeattleHiFi]

Hello all

My MR77 tuner tuning strength meter bulb is out. I have some leftover #1847 bulbs from replacing bulbs on my old MC2105 and while i am removing the bottom plate, I would like to replace the front panel bulbs too. The service manual calls for #1847 for meters, which I presume is for the signal strength indicator and the tuning meter. However, the front panel lights call for a #1866. The only difference between these two bulbs that I can find, is that the 1847 draws less power at .15 amps than the #1866 at .25 amps.

Can I safely use the 1847 meter bulbs in place of the 1866 for the front panel? Seems like it should be ok since it will draw a little less power, I know it will be a little dimmer but not by much I would think.

Thank you!

 

[jlovda]

Why?

 

[SeattleHiFi]

Why what? I would simply like to know if the bulbs I have on hand will work.

 

[SeattleHiFi]

If my post wasn't clear enough, I have a pack of new #1847 bulbs, wondering they will work fine for the almost identical seeming #1866.

 

[jlovda]

I'm sure the Mac engineers thought that 1847 bulbs would be too dim for that application. The light has to be spread out by the clear plastic diffuser before coming out through the green tinted lettering. The lettering at the farthest distance from a lamp (usually at the edges) MAY be dimmer than those in the center. I believe the MR77 only has three lamps across the bottom. Why not just buy three warm white, bright LED replacements and be done with it.

 

[clinic-audio]

Why what? I would simply like to know if the bulbs I have on hand will work.

Yes , WHY ?
If Mc Intosh lab is using #1866 this not because they have plenty in stock
Think before to do things
on electrical point of view (as John said) they will work but too dim for that application . The problem in itself is not the difference of power consuption , this is a "filament" reason . There is a huge difference

 

[SeattleHiFi]

I'm sure the Mac engineers thought that 1847 bulbs would be too dim for that application. The light has to be spread out by the clear plastic diffuser before coming out through the green tinted lettering. The lettering at the farthest distance from a lamp (usually at the edges) MAY be dimmer than those in the center. I believe the MR77 only has three lamps across the bottom. Why not just buy three warm white, bright LED replacements and be done with it.

Thank you,

I didn't know they made LED drop in replacements for these. I was under the impression one had to do some electrical modification to use LEDs.

Probably will stick to the bulbs anyway, I like the look.