Tube Rolling w/Crack

[ipetruk]

RCA 12AU7 are usually the cheapest and among the best tubes for Crack. Unlike power tubes, here price does not normally correlate with quality. With power tubes 5889 and GEC are normally much better than stock

[monsterdonkey]

I’ve got a few RCA 12AU7 variants including a clear top, a grey plate, and a black plate 5963. They all sound great with my TS/Chatham 2399. The clear top is a little bright with my GE 6080, but good with the 2399 and 6AS7G. I think what I’m looking for changes from time to time. Sometimes a dark recording needs that little top end boost. The other day I plugged my Sennheiser HD600 directly into my NAD C740, which I can’t remember doing since building the Crack almost ten years ago because why would I, and was pleasantly surprised.

[Mucker]

........ the donkey was large ... big .... huge ... gigantic ..... it was a Monster ..... a monsterdonkey! I have nothing else .......

[trickyricky123]

RCA 12AU7 are usually the cheapest and among the best tubes for Crack. Unlike power tubes, here price does not normally correlate with quality. With power tubes 5889 and GEC are normally much better than stock

I can see RCA 12AU7 and RCA 12AU7A? Any significant difference between these?

[Paul Birkeland]

No, the A suffix means it works properly in circuit with lots of tube heaters strung together in series.  This isn't something you're going to run into much in modern HiFi.

[alanchongth]

Hi, I am new here. Can Russian 6H5C (6N5S) use directly in Crack 1.1? Thanks in advance ...

[Paul Birkeland]

Yes.

[alanchongth]

Good day. I have another question, can E80CC be used directly in Crack 1.1 without speed ball upgrade? I have speed ball kit but not yet implement. I am planning to enjoy Crack original version for a while, then only upgrade to speed ball version.

Thank you.

[Paul Birkeland]

I would change the 22.1K plate loading resistors to 47K/2W resistors if you want to do that.