[JTori]

A new chapter in my own tube-rolling adventures -> Going from 3 to 4 tubes on my Crack . This with an 6080 -> dual A2293 adapter.
Did anyone notice the A2293 is only 0,95A -> more driver options .



At this moment in time i've only changed the output tube. I'm not noticing much difference from my GEC 6080.
I'll try to write a comparison soon. Comparing GEC 6080 with the GEC A2293's in detail.
And maybe also compare single vs dual drivers, so a dual GEC tube Crack vs four GEC tube Crack.

Fascinating. I've got a Crack and am interested in the benefits to this approach.

Best,

Joe.

 

[cddc]

A new chapter in my own tube-rolling adventures -> Going from 3 to 4 tubes on my Crack . This with an 6080 -> dual A2293 adapter.
Did anyone notice the A2293 is only 0,95A -> more driver options .



At this moment in time i've only changed the output tube. I'm not noticing much difference from my GEC 6080.
I'll try to write a comparison soon. Comparing GEC 6080 with the GEC A2293's in detail.
And maybe also compare single vs dual drivers, so a dual GEC tube Crack vs four GEC tube Crack.

"Did anyone notice the A2293 is only 0,95A -> more driver options"

Interesting, you mean you've tried them in the 12AU7 socket?

I think 0.95A is close to 0.9A from ECC32.

I normally do not like miniature tubes thou.

 

[attmci]

"Did anyone notice the A2293 is only 0,95A -> more driver options"

Interesting, you mean you've tried them in the 12AU7 socket?

I think 0.95A is close to 0.9A from ECC32.

I normally do not like miniature tubes thou.

I recall the 5998 or a pair of 6bl7 with adapter plus a 7316 are the best match for me. All the others are just waste of time and $$. But that was fun.

 

[cddc]

5998 indeed sounds very good.

I had some reading on 6BL7/6BX7 some time ago...it seems to me that some people with WA22 liked them at some point of time but later turned back to 5998. Some Glenn folks still like 6 x 6BL7 in their systems, but that's way beyond Crack's capacity.

 

[cddc]

My current fav driver is TS round plates.

 

[DenverW]

For quite a while I also felt that 6sn7 types were my favorite in my crack/speedball. i was mainly rolling the input tube, and tried everything from 12bh7a to e80cc to 2x7193/cv6.

I was using a 5998 tube in the power 6AS7 socket. Then I ended up finding a western electric 421a, and that changed everything. The tube was lights out better than anything I had previously rolled, in either socket. And oddly enough, it works best with 12au7. So I went back to hunting for rare 12au7, if I could find them for an affordable price. Some are priced so high as to make them ridiculous, like a genelex gold monarch or mullard 10m gold pin ($900?!?), but some rolls Royce 12au7 can be found on the cheap. Siemens chrome plate, 1940s victor/rca black plate, and telefunken smooth plate (sellers don’t always recognize copper rod variants) are some to watch out for. They sound heavenly.

Anyway, don’t discount the 12au7. There is a lot of junk out there that sounds harsh, but the amp was designed for this tube, and there are GREAT ones.

 

[cddc]

Great find on 12AU7s, I think it's all about synergy

 

[BobMonkhouse]

It's very true about the synergy. I prefer the 6SN7 in my Ember but 12AU7 tubes work better for me in my Crack.

 

[DenverW]

Funny enough, right after I posted that I ended up finding three end game Mullard 10M 12au7 gold pin for a non ridiculous price. I’ll keep one and sell the other two. Excited to hear them compared to the non gold pin.

 

[attmci]

Funny enough, right after I posted that I ended up finding three end game Mullard 10M 12au7 gold pin for a non ridiculous price. I’ll keep one and sell the other two. Excited to hear them compared to the non gold pin.

I will spend the money to upgrade the headphones, dac, and amp instead of expensive 12au7. The Bottleheads are good, but still....middle to low-end amps. I have successfully transfer a couple of believers to alternative amps. LOL

These are the best ones if you have $$$$$:

- Gold Monarch B749
- Lorenz welded plate circle getter 12AU7 (even with sub-standard readings!)
- Mullard 10M gold pins 12AU7
- Telefunken ECC802S factory certified version
- Cossor wrinkle glass long welded plate square getter double support
- Siemens chrome plater double getter support ECC82
- Marconi toast plate square getter wrinkle glass B329 (Mullard made)

 

[DenverW]

I have a few of those, one more now that the 10M gold are on the way. I enjoy the collection aspect of things just as much as the sound. The full list from above is:

Amperex long welded plate D-getter 12AU7 (pre-1955)
Chinese stock 12AU7
RCA 1940's black plate square getter 12AU7
Valvo long plate D-getter ECC82 (pre-1955)
Siemens chrome plater double getter support ECC82
Marconi toast plate square getter wrinkle glass B329 (Mullard made)
Telefunken ribbed plate wrinkle glass square getter ECC82 (the most early version)
Telefunken smooth plate copper rod ECC82
Telefunken ECC802S factory certified version
Telefunken ECC802S generic version
Brimar long black plate square getter 12AU7
Brimar half box plate square getter CV4003
Hivac shinny black long smooth side square getter CV491
Gold Monarch B749
Mullard 10M gold pins 12AU7
Cossor wrinkle glass long welded plate square getter double support
12AU7 (likely to be Mullard/Ediswan made)
Lorenz welded plate circle getter 12AU7 (tested below standard!)

 

[cddc]

Holy Moly!

You got way too many 12AU7s buddy

You should also try some Amperex Bugle Boys, I found them very nice sounding.

 

[DenverW]

That’s not my list, I only have about 6 of those. That list is just a reference for totl 12au7.

 

[cddc]

LOL...so it seems to be a long way to go

 

[DenverW]

That’s the fun of it! If I were done collecting I’d be bored .