Spectra Sonics 610

bongo · 11th August 2005

I have one of these that the VU meter bulbs are burned out. Any idea where to get them? There are four bulbs mounted on a card. They appear to bre soldered in.
Thanks

brianroth · 12th August 2005

My copy of the 610 manual is completely devoid of any specs for the lamps. See if you can find any markings, anywhere, on the glass bulb or metal base. You will probably need to use a magnifying glass.

Bri

bongo · 13th August 2005

Even with a magnifying glass, these 51 year old eyes could see no markings. And I think my VOM is on the fritz, I did't get a dc voltage reading, only a 27 V AC.

brianroth · 13th August 2005

The schemo shows the four bulbs are wired in parallel, then across the secondary of the power transformer, with a 47 Ohm resistor in series with one end of the lamp "cluster". That explains why you were seeing AC there.

Taking an educated guess, if the bulbs were each rated at 24V, 25 mA, with four pulling a total of 100 mA, then there would be 4.7V dropped across the resistor...getting into the ballpark of 24V across the cluster.

Bri

PS, *these* 51 year old eyes frequently need an assist from a magnifier as well, even with the fancy "progressive lenses" in my eyeglasses.......

http://www.rothtech.org/queue/IMG_0511.JPG

tmarra · 13th August 2005

Being someone who hates the look of burnt out light bulbs in VU meters, I just quickly modified a SS 610 that I had in here for service. I replaced the 4 burnt out lamps with 4 amber LED's. I put the 4 in series with a diode, 1K resistor and a cap across the rectified DC. It all fit in very nicely on the SS pcb.

While not being as bright as the lamps were, I doubt the customer will ever have to look at a non-illuminated VU ever again.

-Tony

PS: Brian, thanks for the info! The unit calibrated out perfectly.

bongo · 13th August 2005

Thanks Brian and Tony.

Infernal Device · 17th August 2005

We have a pair of 610's and the same thing happened. We sent them back to the factory last year, and they recapped them and changed the meters.

Damn they sound great. Get yours recapped man!

Once the red light comes on, it starts to sound good.

spectracasey · 5th September 2007

Here's the new Spectra Sonics website: Spectra Sonics 610 Home

11th August 2005	#1
bongo Lives for gear Joined: Mar 2004 Location: Pocono Mountains of PA Posts: 817 Thread Starter	Spectra Sonics 610 I have one of these that the VU meter bulbs are burned out. Any idea where to get them? There are four bulbs mounted on a card. They appear to bre soldered in. Thanks __________________ If you can't hear a difference then there is no difference. redrockrecording.com

12th August 2005	#2
brianroth Lives for gear Joined: May 2005 Location: Oklahoma City Posts: 1,818	My copy of the 610 manual is completely devoid of any specs for the lamps. See if you can find any markings, anywhere, on the glass bulb or metal base. You will probably need to use a magnifying glass. Bri __________________ Brian Roth Technical Services Oklahoma City, OK www.BrianRoth.com

13th August 2005	#5
tmarra Gear addict Joined: May 2005 Location: Las Vegas Posts: 307	Being someone who hates the look of burnt out light bulbs in VU meters, I just quickly modified a SS 610 that I had in here for service. I replaced the 4 burnt out lamps with 4 amber LED's. I put the 4 in series with a diode, 1K resistor and a cap across the rectified DC. It all fit in very nicely on the SS pcb. While not being as bright as the lamps were, I doubt the customer will ever have to look at a non-illuminated VU ever again. -Tony PS: Brian, thanks for the info! The unit calibrated out perfectly. __________________ Tony Marra Just ask the Axis, He knows everything ... For current projects follow us on Facebook http://www.Facebook.com/thermalrelief For special deals, fun and trivia, follow us on Twitter www.twitter.com/focusritetech - Tony www.twitter.com/liquidrelief - Thermal Relief Design www.thermalrelief.com www.trdpartsonline.com

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17th August 2005	#7
Infernal Device Lives for gear Joined: Aug 2005 Location: USA Posts: 1,122	We have a pair of 610's and the same thing happened. We sent them back to the factory last year, and they recapped them and changed the meters. Damn they sound great. Get yours recapped man! Once the red light comes on, it starts to sound good.

5th September 2007	#8
spectracasey Gear interested Joined: Sep 2007 Location: Utah Posts: 3	Here's the new Spectra Sonics website: Spectra Sonics 610 Home