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 Post subject: 6S6 Lamp
PostPosted: May Mon 13, 2019 7:14 pm 
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Location: Santa Rosa, CA
I bought a box of old tubes at a flea market yesterday. Included was a carton (10) 6S6 Chicago Miniature lamps. 30 Volts, candelbra base.

What were these used for?

They are in a CML carton, but the glass is marked Sylvania.

Rich


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 Post subject: Re: 6S6 Lamp
PostPosted: May Mon 13, 2019 7:58 pm 
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Some old Audio Oscillators used lamps like those in there circuits. I seem to remember that the ARRL Handbook in the test equipment section had a circuit that used a low voltage lamp.


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 Post subject: Re: 6S6 Lamp
PostPosted: May Tue 14, 2019 4:23 am 
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I had an old Hickok audio generator, likely pre-WW2, which used a lamp filament in the oscillator circuit. Screw base, most likely that was the one. And it had to be the specific lamp it was designed for, it wouldn't start oscillating on all ranges if you tried to use a different one like a night light lamp.

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 Post subject: Re: 6S6 Lamp
PostPosted: May Tue 14, 2019 7:26 pm 
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Location: Oswego, NY, USA
Have a box of 10 (Philips brand) 6S6 lamps left over from some retired (Precision, Chicago) lab ovens, where these lamps were used as indicator lamps on the panels. The Volts are listed on the box and lamps as "130 Volts". Some 1960's lab melting point (Thomas-Hoover& FisherSci) units also used 6S6's as their illumination lamps to view the capillary tubes. So it was pretty common in some older lab equipment.


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 Post subject: Re: 6S6 Lamp
PostPosted: May Wed 15, 2019 12:43 am 
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120 and 130 volt 6S6 lamps are commonly used as pilot lamps in all sorts of things, not just electronics. They were available in a wide range of voltages. 140 volt ones are for exit signs. I have no idea where 30 volt lamps would be used, possibly for long life on a 24 volt circuit.

The lamp in audio oscillators was usually a 120 volt 3S6. But I won't say that EVERY one used this.

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 Post subject: Re: 6S6 Lamp
PostPosted: May Thu 23, 2019 8:44 pm 
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Some 35mms theatre projectors used the 6S6 120 volt bulb as a "framing lamp", to enable the operator to thread the film properly.

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 Post subject: Re: 6S6 Lamp
PostPosted: May Thu 23, 2019 9:06 pm 
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Location: Norfolk, VA
Jim Mueller wrote:
120 and 130 volt 6S6 lamps are commonly used as pilot lamps in all sorts of things, not just electronics. They were available in a wide range of voltages. 140 volt ones are for exit signs. I have no idea where 30 volt lamps would be used, possibly for long life on a 24 volt circuit.

The lamp in audio oscillators was usually a 120 volt 3S6. But I won't say that EVERY one used this.



6S6-120V is the one in HP Wien-Bridge stuff like the 200CD. HP part number 2140-0002, NSN 6240001433049.

I've personally never seen the 32V version - but there are plenty of references to it elsewhere.

There are also 48V, 60V and 75V, and 130V versions of the 6S6 incandescent lamp. All references to the 6S6-130V fall in HVAC manufacturers....

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 Post subject: Re: 6S6 Lamp
PostPosted: May Thu 23, 2019 11:48 pm 
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Quote:
6S6-120V is the one in HP Wien-Bridge stuff like the 200CD. HP part number 2140-0002, NSN 6240001433049.

My manuals for the HP 200CD list the lamps as 10W 250V, part numbers 211-29 in the older manual and 2140-0007 in the newer.

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 Post subject: Re: 6S6 Lamp
PostPosted: May Fri 24, 2019 3:34 am 
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Location: Norfolk, VA
Jim Mueller wrote:
Quote:
6S6-120V is the one in HP Wien-Bridge stuff like the 200CD. HP part number 2140-0002, NSN 6240001433049.

My manuals for the HP 200CD list the lamps as 10W 250V, part numbers 211-29 in the older manual and 2140-0007 in the newer.



Odd, as DoD's logistics manual lists the 2140-0002 as a stocking spare for the 200CD, sadly NLA.. :? ... They list the 200A and 200B as well - I can find the 2140-0002 in the 200A/200B manual, but not in the 200CD. It may be DoD saying (incorrectly) "200CD replaced the 200A and 200B, so lets associate those parts with the 200CD...."

The circuits are widely different....good catch!

Irregardless, the lamp never lights in a Wien oscillator - it's resistance characteristics are what matters. Use what's specified in the manual and it'll never fail ya.

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Brian
"Capacitor Cosmetologist since 1979"
USN Retired 1984-2006 (Avionics/Cal)


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 Post subject: Re: 6S6 Lamp
PostPosted: May Sat 25, 2019 6:43 am 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: 253 Blanche St. Plymouth, MI USA
28v rating is usually aircraft. Bayonet base only.
Mark Oppat


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