tube dissipation

[justinsweber]

R18,R19 1.5K, 3W
72-RWM410-1K5-5 0.63
Use these for >19W dissipation power tubes

R18,R19 1.8K, 3W
72-RWM410-1K8-5 0.50
Use these for <19W dissipation power tubes


This is from the parts list for the 6l6 version of the Clementine.
The question is: which dissipation is a 6L6gc? How do I find out?

Thank you,

Justin

[Ty_Bower]

The question is: which dissipation is a 6L6gc? How do I find out?

Metal tube 6L6, glass tube 6L6-G, 6L6-GA, and 6L6-GB are all 19 watt tubes. The 6L6-GC is a 30 watt rated tube. This rating is for the total dissipation (heat) the plate can withstand, and is not necessarily a direct indication of how much audio power you can extract from the tube.

I like to look up my quick tube specifications here:
http://tdsl.duncanamps.com/tubesearch.php

Just type in the tube designation and hit Query. In this case, the information you seek is noted under PaMax. P is for power (volts times amps, or watts) and a is for anode (the plate).

[justinsweber]

THANK YOU :-)

[Shannon Parks]

FWIW, I've been using the more conservative cathode network on everything for backwards compatibility. This permits me to run 6L6GAs *and* 6L6GCs.

Shannon

[Quad]

Metal tube 6L6, glass tube 6L6-G, 6L6-GA, and 6L6-GB are all 19 watt tubes.

How good are the metal tube 6L6s for audio? I may have
a few somewhere.

[EWBrown]

The metal 6L6s would be perfectly good for audio, just a little less output power than the more modern 6L6GCs.

The metal shells can get very hot during normal operation, and can raise a good juicy blister on a careless finger

/ed B

[Quad]

The metal 6L6s would be perfectly good for audio, just a little less output power than the more modern 6L6GCs.

The metal shells can get very hot during normal operation, and can raise a good juicy blister on a careless finger

/ed B

Thanks, Ed. Glad to know those tubes can be put to good use.

[highflyin9]

R18,R19 1.5K, 3W
72-RWM410-1K5-5 0.63
Use these for >19W dissipation power tubes

R18,R19 1.8K, 3W
72-RWM410-1K8-5 0.50
Use these for <19W dissipation power tubes

Just to confirm, this is read as:
1.5K, 3W
Use these for GREATER THAN 19W dissipation power tubes

1.8K, 3W
Use these for LESS THAN 19W dissipation power tubes

Right? :)

[EWBrown]

I added a little clarification, so that "exactly"19W is not "excluded" :

Just to confirm, this is read as:
1.5K, 3W
Use these for GREATER THAN 19W dissipation power tubes

1.8K, 3W
Use these for 19W. or LESS THAN 19W dissipation power tubes

Right? :)

HTH

/ed B

[jukingeo]

The metal 6L6s would be perfectly good for audio, just a little less output power than the more modern 6L6GCs.

The metal shells can get very hot during normal operation, and can raise a good juicy blister on a careless finger

/ed B

Better yet, if you have cats and and they get their noses too close to the metal tubes, you can 'raise' the entire cat a few feet in the air. Pretty impressive stuff! Just another use for hot metal tubes.