[Wes S]

Here is the link for the tubes I am selling.

https://www.head-fi.org/threads/tubes-for-sale-holy-grail-6922’s-and-variants-priced-to-sell.951868/

 

[nwavesailor]

Here is the link for the tubes I am selling.

https://www.head-fi.org/threads/tubes-for-sale-holy-grail-6922’s-and-variants-priced-to-sell.951868/

If folks are looking for hard to find killer 6922, snag some of these and same some $$$ as well!

 

[TK16]

These should get you a nice pair of Heerlen D getter ECC82 long plate. Decent priced.
https://www.ebay.com/itm/Vtg-Rare-W...rentrq:ec836ef51760a9bdb1b9bae3fff2662a|iid:1
https://www.ebay.com/itm/TESTED-195...rentrq:ec836ef51760a9bdb1b9bae3fff2662a|iid:1

 

[JohnnyOps]

These tubes are a Tubemonger exclusive and can be found here:
https://www.tubemonger.com/Mullard_CV3986_6021_1975_Mitcham_E88CC_SUB_NOS_p/ex-6021m.htm

Does anyone know if the mini-Mullards will ever be available again? I’ve never seen a used pair... thanks.

 

[George Chronis]

I’m just catching up on this thread. Does someone have a pair of 7730s they’re willing to sell or trade? Wanted to try them. I can’t find any in the classifieds. Thanks!

 

[skor]

I’m just catching up on this thread. Does someone have a pair of 7730s they’re willing to sell or trade? Wanted to try them. I can’t find any in the classifieds. Thanks!

These are rare and very hard to find. I have been searching for a matched pair for better part of a year and got lucky when @Slim1970 sold me a pair (thank you!). I have purchased several tubes over the last 2 years based on recommendations from the awesome members on this thread (e.g. Sylvania 6922, Brimar CV2492m Amperex PQ 6922 , Amperex ECC88 Heerlen Holland 1959), etc.) and these top them all. Well worth the wait and investment if you can locate a pair.

 

[George Chronis]

Thank you. Yes, I just saw someone had some for sale on this thread but couldn’t find them in classifieds at all, so I guess they’re sold or I’m not looking at the right place. I can’t even find a sold post.

These are rare and very hard to find. I have been searching for a matched pair for better part of a year and got lucky when @Slim1970 sold me a pair (thank you!). I have purchased several tubes over the last 2 years based on recommendations from the awesome members on this thread (e.g. Sylvania 6922, Brimar CV2492m Amperex PQ 6922 , Amperex ECC88 Heerlen Holland 1959), etc.) and these top them all. Well worth the wait and investment if you can locate a pair.

 

[skor]

Posted some tubes for sale.

 

[Wes S]

I listed some more 6922 tubes for sale.

https://www.head-fi.org/threads/more-tubes-for-sale-holy-grail-6922-and-variants-nos.951956/

 

[George Chronis]

I just wanted to say, I got the entire previous batch from Wes and not only it was one of the best transactions I had ever, but the tubes are top notch and his asking price is way below ebay, let alone well known stores. I'd jump on those. You all probably already know that in this thread, though

I listed some more 6922 tubes for sale.

https://www.head-fi.org/threads/more-tubes-for-sale-holy-grail-6922-and-variants-nos.951956/

 

[George Chronis]

Maybe this is the wrong thread to ask, but since you’re all knowledgeable... if I should post somewhere else, please, let me know:

I recently bought a Hickok 533A. Brand new components, calibrated, very nice. I’m a bit confused on some of the values I see on tubes. For the 6922 variety for example, the 533A lists 6500 micromhos as the average target for a good tube. I get a bit more than that with most of my tubes, but most vendors list a 15k or so number for micromhos. Are they using a different bias or something? Seems they are all standardized but not what the 533A lists.

Also, some use percentage numbers and some numbers around the 100 values.

What gives? I’m confused

 

[TK16]

Maybe this is the wrong thread to ask, but since you’re all knowledgeable... if I should post somewhere else, please, let me know:

I recently bought a Hickok 533A. Brand new components, calibrated, very nice. I’m a bit confused on some of the values I see on tubes. For the 6922 variety for example, the 533A lists 6500 micromhos as the average target for a good tube. I get a bit more than that with most of my tubes, but most vendors list a 15k or so number for micromhos. Are they using a different bias or something? Seems they are all standardized but not what the 533A lists.

Also, some use percentage numbers and some numbers around the 100 values.

What gives? I’m confused

Got a Hickok 752, I know how to test tubes and I'm far from an expert, but have some thoughts. Different testers have different ranges. 6922's have NOS at 12,500 on mine. ECC81/6201 is only 3,000 Gm NOS and many testers have NOS at 5,500. Almost all tubes have been tested well over 3,000. So I'd say anything over 6,500 Gm can be considered over NOS for your 6922's. As a last comment on my tester, ECC82 on my tester NOS is 2,200 Gm, same tubes on a Hickok 539C NOS is 2,800 or 2,900. If you consider selling any 6922 if you list 6,500 as a Gm, nobody is going to buy em. Note 6,500 Gm is NOS on your 533.
What's NOS on ECC82 on your Hickok 533? Think it's the same as a 539.

 

[George Chronis]

Got a Hickok 752, I know how to test tubes and I'm far from an expert, but have some thoughts. Different testers have different ranges. 6922's have NOS at 12,500 on mine. ECC81/6201 is only 3,000 Gm NOS and many testers have NOS at 5,500. Almost all tubes have been tested well over 3,000. So I'd say anything over 6,500 Gm can be considered over NOS for your 6922's. As a last comment on my tester, ECC82 on my tester NOS is 2,200 Gm, same tubes on a Hickok 539C NOS is 2,800 or 2,900. If you consider selling any 6922 if you list 6,500 as a Gm, nobody is going to buy em. Note 6,500 Gm is NOS on your 533.
What's NOS on ECC82 on your Hickok 533? Think it's the same as a 539.

This is extremely helpful. Thank you. I suspected that much: different NOS values for different testers and they probably depend on the settings each tester applies to the tube. Apparently, most testers for the 6922 share the 12500 value, but mine is at 6500. And what you said about listing them as my tester shows is going to pretty much guarantee that nobody buys them is true. That's what actually prompted my question. I was going to try to be fair to all buyers and post pictures of my testing before I list tubes, but good luck explaining that my 6500 is the same as others' 12500. Everyone is going to think I'm lying, unless they actually get the Hickok 533 manual, read it and know what they're doing.

ECC82 on mine is 2200.

I wonder if there is some kind of conversion for what is considered NOS between different testers, based on what settings each tester applies. That would at least give me a way to equalize the field a bit (with all the culprits of different calibrations, testers not being that accurate in general etc.).

At any rate, thank you very much for taking the time. This is helping me very much.

 

[TK16]

No, you can sell tubes with a 6,500 reading and mention NOS on your tester NOS is 6,500. 6,500 NOS testing mentioning on a Hickok 533 and your fine bro.

 

[George Chronis]

No, you can sell tubes with a 6,500 reading and mention NOS on your tester NOS is 6,500. 6,500 NOS testing mentioning on a Hickok 533 and your fine bro.

I hope so. but earlier you said "If you consider selling any 6922 if you list 6,500 as a Gm, nobody is going to buy em." You mean if I also say 6500 is NOS on my tester which is a 533A, then people will understand? Let's hope so. I guess we shall see...