Is this ok

tofts · 5th October 2010, 05:58 PM

Was taking some HQ long exposures of my RM100.

Noticed a blue glow, I think this is ok, but I thought I would double check.

I know in some cases it could mean they need rebias/replacing

Ultra HQ Version of Above

Ultra HQ Version of Above

Thanks,

Jody

piano3 · 5th October 2010, 06:13 PM

Is the getter nearly gone?-that is,I think, when I have seen this.

Mooly · 5th October 2010, 06:13 PM

Can you see the blue by eye in the dark ? or just on a long camera exposure.

athos56 · 5th October 2010, 06:19 PM

I've read that the 6l6s glow like this, AFAIK it is ok.

tofts · 5th October 2010, 06:22 PM

Yes, you can see it if its pitch black. But not evident with lights on.

HollowState · 5th October 2010, 06:28 PM

Quote:

Originally Posted by tofts

Noticed a blue glow, I think this is ok, but I thought I would double check.

A little blue glow on the inside of the glass envelope is quite normal for output tubes. It's caused by residual outgas from the metal elements being bombarded. Nothing much to be concerned with. A blue haze or glow inside the plate structure would be cause for concern. But this is not the case here.

Mooly · 5th October 2010, 06:33 PM

Quote:

Originally Posted by tofts

Yes, you can see it if its pitch black. But not evident with lights on.

I think it's probably OK too.

tofts · 5th October 2010, 06:44 PM

Just another quick query, I have been told that I could use other types of valves when I come to replace these ones. I know the KT66 has the same pins as the 6L6, but what other valves would offer similar specs?

Presumably I could drop them in, rebias and off I go. So long as the replacement valve are similar in specification. I know heater current draw can be vastly different, but judging by the shear size of the power transformer I don't think it should be an issue.

M Gregg · 5th October 2010, 06:52 PM

Quote:

Originally Posted by tofts

Was taking some HQ long exposures of my RM100.

Noticed a blue glow, I think this is ok, but I thought I would double check.

I know in some cases it could mean they need rebias/replacing

Thanks,

Jody

Just for interest here is a link!

Wapedia - Wiki: Vacuum tube.

Regards
M. Gregg

M Gregg · 5th October 2010, 06:57 PM

I think it is O.K.

Is the amp auto bias or fixed bias?

5th October 2010, 05:58 PM	#1
tofts diyAudio Member Join Date: Jan 2008	Is this ok Was taking some HQ long exposures of my RM100. Noticed a blue glow, I think this is ok, but I thought I would double check. I know in some cases it could mean they need rebias/replacing Ultra HQ Version of Above Ultra HQ Version of Above Thanks, Jody

5th October 2010, 06:13 PM	#3
Mooly diyAudio Member Join Date: Sep 2007	Can you see the blue by eye in the dark ? or just on a long camera exposure. __________________ ------------------------------------------------------- *A simulation free zone.* *Design it, build it, test it.*

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5th October 2010, 06:13 PM	#2
piano3 diyAudio Member Join Date: Aug 2010 Location: London,UK	Is the getter nearly gone?-that is,I think, when I have seen this.

5th October 2010, 06:19 PM	#4
athos56 diyAudio Member Join Date: May 2006 Location: Yakima, Washington	I've read that the 6l6s glow like this, AFAIK it is ok.

5th October 2010, 06:22 PM	#5
tofts diyAudio Member Join Date: Jan 2008	Yes, you can see it if its pitch black. But not evident with lights on.

5th October 2010, 06:44 PM	#8
tofts diyAudio Member Join Date: Jan 2008	Just another quick query, I have been told that I could use other types of valves when I come to replace these ones. I know the KT66 has the same pins as the 6L6, but what other valves would offer similar specs? Presumably I could drop them in, rebias and off I go. So long as the replacement valve are similar in specification. I know heater current draw can be vastly different, but judging by the shear size of the power transformer I don't think it should be an issue.

5th October 2010, 06:57 PM	#10
M Gregg diyAudio Member Join Date: Jun 2010 Location: UK	I think it is O.K. Is the amp auto bias or fixed bias?

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