[JTbbb]

I just picked up some Tung Sol Black Glass on eBay for around $150/pr

Crickey, that was a lucky find! A matching pair testing at NOS or close to? Not rebranded?

 

[Ayaka]

Those are Western Electric 300B tubes in my Woo Audio WA5-LE amplifier. Not all do this, mostly the WE's and some Takatsuki 300B's will do it (as well as a few others). It's an effect caused by some electrons hitting the glass. You can read more about it HERE

Oh thanks for the link, will read it! Unfortunately my amp is not using 300B tubes... only 6sl7, 6sn7 and el34.

 

[ColSaulTigh]

Crickey, that was a lucky find! A matching pair testing at NOS or close to? Not rebranded?

I got lucky on a bid. They are matched pair, NOS, and they are Tung-Sol branded. Yes, they're all running in the $400+ range now. Every now and then I stumble across a good find. I check eBay nightly (along with the Classifieds and a few other pages) for deals.

 

[Galapac]

Oh thanks for the link, will read it! Unfortunately my amp is not using 300B tubes... only 6sl7, 6sn7 and el34.

If your amp can take 6L6GC tubes, which are similar to EL34, many of those glow blue too.

 

[JTbbb]

Am I correct with this Marconi Osram, being week 4? March 1946?

 

[Ayaka]

If your amp can take 6L6GC tubes, which are similar to EL34, many of those glow blue too.

Do you know if I can use 6L6GC in an R8?

 

[ColSaulTigh]

Do you know if I can use 6L6GC in an R8?

Wait until you see what I've got coming next week.... ;D

 

[Ayaka]

Wait until you see what I've got coming next week.... ;D

? can’t wait. But I searched a bit on google, can’t find if 6L6GC are compatible with Willsenton r8

 

[ColSaulTigh]

? can’t wait. But I searched a bit on google, can’t find if 6L6GC are compatible with Willsenton r8

It's a Volkswagon, so it's used to belching black smoke and failing emissions tests! But no....

 

[Galapac]

Do you know if I can use 6L6GC in an R8?

You could check with the manufacturer as I am not aware of that amp.
If the amp has auto-bias it may work but you should ask the vendor.
https://killerrig.com/6l6-vs-el34-tubes/

 

[Ayaka]

You could check with the manufacturer as I am not aware of that amp.
If the amp has auto-bias it may work but you should ask the vendor.
https://killerrig.com/6l6-vs-el34-tubes/

Yes, but the R8 is pretty well known, I thought I would find the information easily. But I’m sure someone in this forum knows

 

[Galapac]

Yes, but the R8 is pretty well known, I thought I would find the information easily. But I’m sure someone in this forum knows

I saw that it can also take KT88s or 6550s so it may have auto bias.
Someone will chime in I'm sure.

 

[Ayaka]

I saw that it can also take KT88s or 6550s so it may have auto bias.
Someone will chime in I'm sure.

Yes you can use kt88 or 6550, there’s a switch at the back of the amp for that. But you have to bias yourself, using a small screwdriver. Also when you change el34 quad for another. (Biased newly received TS EL34B just few minutes before )

 

[triod750]

The NU 6C8G to the left has code IU; what does that mean? And who made the 'Mullard Amerty' second from right? No codes.

 

[TLO]

The NU 6C8G to the left has code IU; what does that mean? And who made the 'Mullard Amerty' second from right? No codes.

TS 6C8G BGRP