[TK16]

Excellent price on a quad of 62 Heerlen E88CC. OBO too.
https://www.ebay.com/itm/Philips-Mi...ubes-Gold-Pin-SQ-Qty-4-6DJ8-6922/163062568197

 

[koover]

Excellent price on a quad of 62 Heerlen E88CC. OBO too.
https://www.ebay.com/itm/Philips-Mi...ubes-Gold-Pin-SQ-Qty-4-6DJ8-6922/163062568197

This is soooo tempting but maybe someone else will take advantage of these. That’s smokin.

 

[OldSkool]

BF, I would have been all over that Heerlen quad.

You know, BF......Before Fotons.

 

[gardibolt]

According to eBay my Tesla PWs are still sitting somewhere in Prague. What it's been nearly two weeks.

 

[koover]

According to eBay my Tesla PWs are still sitting somewhere in Prague. What it's been nearly two weeks.

Same with me.

 

[bcowen]

Hi bc,
These are 6N7 octal tubes. With a ECC31 to 6SN7 adapter they can be used as 6SN7 tubes.
They are dirt cheap since they have no tube glow or visual appeal, but sound very good.
I recently bought a pair for $5 + $7 shipping (the seller accepted a $5 best offer instead of $10). The tubes are from 1944 and looked like they never were out of the original boxes.
https://www.ebay.com/itm/312140530736?ViewItem=&item=312140530736
https://www.ebay.com/itm/2pc-Gold-p...062593?hash=item2cd02b5841:g:3-UAAOSwMmBVvXRv

Thanks for the info! Decided I just *had* to give it a try. Went with a 7N7 as I wasn't sure about the Lyr 3's ability to handle the 800 ma heater current of the 6N7. Have an adapter on the way from the far east (another friggin' adapter...I need to shoot myself in the head), so it will be a bit before I can try these out.

 

[Oskari]

I hope you didn't order the 6N7 adapter for the 7N7…

 

[bcowen]

I hope you didn't order the 6N7 adapter for the 7N7…

No, ordered the correct adapter. Remains to be seen if it's wired right.

 

[Oskari]

No, ordered the correct adapter. Remains to be seen if it's wired right.

That should work.

The 7N7 is a 6SN7GT with a loctal base. It's not a 7V 6N7. I know it's complicated…

 

[Phantaminum]

That should work.

The 7N7 is a 6SN7GT with a loctal base. It's not a 7V 6N7. I know it's complicated…

@Oskari Can you verify if all 7n7 tubes were made by Sylvania or did TS and other tube mfg make 7n7 tubes as well?

 

[bcowen]

That should work.

The 7N7 is a 6SN7GT with a loctal base. It's not a 7V 6N7. I know it's complicated…

I thought I was fairy edumacated on tubes until I came to Head-Fi six months ago. In short order I was listening to a 6CG8 playing tunes out of the Vali 2. Who knew?

 

[Oskari]

@Oskari Can you verify if all 7n7 tubes were made by Sylvania or did TS and other tube mfg make 7n7 tubes as well?

It is believed that most were made by Sylvania, but that some were made by NU. Oddly enough, the tubes in this photo have the 322 code for TS.

The photo is not very sharp. I assume that the tubes were made by Sylvania anyway. These EIA codes are not always reliable.

 

[bcowen]

It is believed that most were made by Sylvania, but that some were made by NU. Oddly enough, the tubes in this photo have the 322 code for TS.

The photo is not very sharp. I assume that the tubes were made by Sylvania anyway. These EIA codes are not always reliable.

Am I correctly interpreting the dates on those as March, 1955 on the left and October, 1954 on the right?

 

[Oskari]

Am I correctly interpreting the dates on those as March, 1955 on the left and October, 1954 on the right?

Yes, I guess you can say that. (It kind of depends how they counted the weeks. )

 

[TK16]

Good testing Amperex 6922 USA 59 single. $200. Other PW on eBay is $450.
https://www.ebay.com/itm/AMPEREX-69...C-Gold-Pin-Low-Noise-Preamp-Tube/202321817371