| karma |
i could of got the more pricy one but no i wanted to save a buck
if you look in the pic you can see one of the plates glowing red not good.and the filement looks to a little brighter. yet my old ones work fine. im looking at a bias ajustment right? i only paid
19$ for the set and there matched:bawling: |
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| karma |
or is it i just never looked at them in the dark hmm:rolleyes:
hmm kinda has purple rings to top and bottom cool:clown: |
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| Duo |
| You mean they have purple rings around when they are on??? |
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| karma |
| na ill just keep em for testers. im going to pick up the one's i wanted thursday. ill likelly need to bias them |
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| karma |
ya when there on looks kinda cool:)
purple haze |
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| Duo |
| If they're glowing with purple when they're on, the the tubes are gassy, which they should not be... Unless these are thyratrons or regulators, which I doubt they are judging by their configuration and the fact that you are biasing them. |
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| karma |
there 6l6 gb's in push pull but i did replace the rectifier to
i didnt bias them yet |
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| karma |
| ill see if i can get a pic with the purple haze so you can judge it |
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| karma |
| forget it cam cant pick it up o well;) |
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| Brett |
| Try the Svetlana's. From a number of reports I've read, they're very, very good even against the best NOS, and as tough as nails. |
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| Colt45 |
| The plate glowing red is a bias problem, not a tube problem.. |
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| karma |
| i here ya. but i want to still get the better ones than ill worry about the bias;) |
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| Brett |
| quote: | Originally posted by Colt45
The plate glowing red is a bias problem, not a tube problem.. |
D'oh. I missed the red glow (which is likely bias) and was thinking about the blue halo's which likely indicate gassiness to me. However, if they're supposed to conform to a 6L6 spec, and they glow red, then I'd wonder if they even meet spec, as it was indicated the previous tubes ran fine. If the design runs the tubes on the ragged edge, then it might be OK, but if it doesn't, then I'd say the tubes themselves are an issue and would replace them before anything else goes awry. |
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| Colt45 |
oh yeah.. another thing.
you say those are 6L6GB's (20w max diss.). If the amp is designed for 6L6GC 's (rated @ 30w), that would help explain where your glow is coming from too.. |
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| karma |
and another thing the amp is 6l6gb the new tubes are 6l6gc
so thats not the problem.plane and simple you change your tubes
you gota bios the amp. i could leave but i risk loosing my iron and
a short tube life. even in the other socket that one tube still burns
brighter that is weird and its the only one that glows a light red.
over time.im going to pic a pair of these tubes than im going to bios the amp
thank you.....
http://www.thetubestore.com/jan6l.html
brett is right |
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| Remy |
Hi,
Sorry for my bad english
I was reading this forum since a long time, really great people and serious talk about electronics, that's great.
Here's a photo of "blue glowing" in 6L6EH(electro-harmonix). I have 8 tubes of this brand, all tubes show this blue glow when turned on, even after the "burn-in" time of the tube.
The tubes seems to work fine event with showing this blue glow.
Rémy |
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| dhaen |
| quote: | Originally posted by Remy
Hi,
Sorry for my bad english
I was reading this forum since a long time, really great people and serious talk about electronics, that's great.
Here's a photo of "blue glowing" in 6L6EH(electro-harmonix). I have 8 tubes of this brand, all tubes show this blue glow when turned on, even after the "burn-in" time of the tube.
The tubes seems to work fine event with showing this blue glow.
Rémy |
There is no problem when it's on the glass like this. There are various explanantions in other threads. Search for "blue glow".
Cheers, |
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| 316a |
...why use new production in the first place ? Quality does not seem too good at present . I have seen , and tested quite a few recent Sovtek , Ei and Chinese valves . The Sovteks were 6L6's for a guitar amp . Out of 8 I could only make one matched pair , the test result spread was about 15% so these actually aren't that bad . Chinese valves were NOS 6SN7 from the 1970's , appallingly awful , 30% were 'faulty' on the tester for leakage , 50% had poor sectional balance (>20% difference) , leaving 20 almost good ones out of a hundred . Ei were silver plate ECC83 . I could make the gm reading change just by tapping the glass gently . The crimps on the anodes looked suspiciously loose . Back to the supplier they went . I can only recommend if using 6L6 family valves to seek NOS 6BG6G . 6BG6G are just a 6L6 with a topcap . Otherwise 807 , 5B/255M can be substituted for 6L6 with a socket change . 6BG6 , 807 , 5B/255M are all very cheap and available
316a |
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| mig-ru |
| The blue/purple glow like that is fine, that is caused by stray electrons, that miss the plate, hitting the glass. This happens with my triode operated 6197's, looks pretty cool. The bad blue glow is when the whole tube glows blue, that means it has gas in it. |
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| fdegrove |
Hi,
| quote: | | Ei were silver plate ECC83 |
Sure these were made by EI, sounds more like those French Post Office tubes to me...
I think ot is a chromium plating of the anodes, not really my kind of thing...the sound awkward.
Cheers,;) |
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