Marantz 2270 illumination problem

[Nemo]

Hello,

I have a 2270 that I just replaced all the meter and dial lamps. When viewed in normal room light the meter and dial lighting illumination is weak at best. Bulbs are 8V 250ma. Compared to my old 2220B sitting next to it, the 2220B seems twice as bright.

I have not checked the voltage across the light bar, has this been known to drop?

Nemo

 

[Theoberheim]

Try using 8V 200ma fuse lamps. They are a little brighter than the 250 ma's. You may also want to try the LED fuse lamps (Some people swear by them, others swear at them but they are bright.)

 

[marantzfan]

Yeah, be carefull with using anything other then 8v 200ma or led type lamps, because you could melt the little plastic housing that the lamps sit in. I personally prefer the LED's because I like the surreal blue. It's not "original" but damn is it sexy.:yes:

 

[Theoberheim]

I personally prefer the LED's because I like the surreal blue. It's not "original" but damn is it sexy.:yes:

Yup!:yes:

 

[Nemo]

I will go out tomorrow and check the voltage across the dial and meter lights.
Thanks for the advice.

Nemo

 

[dgwojo]

I will go out tomorrow and check the voltage across the dial and meter lights.
Thanks for the advice.

Nemo

Should be around 7.5vac!! Dave.

 

[morgan]

It shouldn't matter what current rating lamps you use in the 2270--the lamp housing is steel!
Some early 2270s used a multivoltage transformer (even the domestic ones!), and for whatever reason the lamp voltage supply is between 7 and 7.5 volts, when operating on 120 VAC.
The only way I was able to increase the illumination was by using 6.3 volt lamps and a dropping resistor. This would all work fine except if one lamp goes down, then the supply voltage increases by a small amount, placing greater stress on the remaining lamps.

 

[Fred Longworth]

In many instances, the dial glass gets a "smoke film" on the inside, along with the dial film on the sliderule dial behind the glass. Pull the frontpanel and clean this.

By the way, for high quality lamps, dgwojo is the guy to get them from.

Fred