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December 01, 2023, 03:03:48 AM

Author Topic: Tube Rolling w/Crack  (Read 695242 times)

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Offline ipetruk

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Re: Tube Rolling w/Crack
« Reply #2430 on: July 06, 2022, 12:37:36 AM »
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
Roon -> Raspberry 4 -> Khadas Tone in Bottlehead Crack+Speedball -> detachable cable modded DT880

Offline monsterdonkey

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Re: Tube Rolling w/Crack
« Reply #2431 on: July 14, 2022, 01:08:27 PM »
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.
« Last Edit: July 14, 2022, 01:09:59 PM by monsterdonkey »

Offline Mucker

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Re: Tube Rolling w/Crack
« Reply #2432 on: July 14, 2022, 01:25:29 PM »
........ the donkey was large ... big .... huge ... gigantic ..... it was a Monster ..... a monsterdonkey! I have nothing else .......

Offline trickyricky123

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Re: Tube Rolling w/Crack
« Reply #2433 on: August 25, 2022, 06:02:55 AM »
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?

Offline Paul Birkeland

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Re: Tube Rolling w/Crack
« Reply #2434 on: August 25, 2022, 06:28:03 AM »
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.
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline alanchongth

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Re: Tube Rolling w/Crack
« Reply #2435 on: June 20, 2023, 07:04:59 PM »
Hi, I am new here. Can Russian 6H5C (6N5S) use directly in Crack 1.1? Thanks in advance ...
« Last Edit: June 21, 2023, 02:10:18 AM by alanchongth »

Offline Paul Birkeland

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Re: Tube Rolling w/Crack
« Reply #2436 on: June 21, 2023, 04:22:48 AM »
Yes.
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline alanchongth

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Re: Tube Rolling w/Crack
« Reply #2437 on: November 05, 2023, 06:30:27 PM »
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.

Offline Paul Birkeland

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Re: Tube Rolling w/Crack
« Reply #2438 on: November 06, 2023, 05:39:47 AM »
I would change the 22.1K plate loading resistors to 47K/2W resistors if you want to do that.
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man