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Author Topic: Testtube  (Read 10936 times)
DaGlenster
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« on: December 09, 2007, 11:09:58 PM »
Today I did a taste test with sets of tubes in my new expression.
Here was the setup:
Expression everything set to 2:00 with the brite switch up (on).
Speaker cabinet, Kerry Wright custom 2x12 with vintaqe 30 celestions
Guitar LP standard: neck PU vol=10 tone-rolled off , Bridge PU vol=3, tone-10
All tubes biased to 3Ma
Tubes: ARS Telsa , Mullards (vintage expensive ones,$100/each), EH & Sovtek. The Mullards, EH & Sovteks I borrowed for the test.

Results (IMHO)
Mullards very mid rangey, less high end shimmer, less ringy on the cleans.when cranked they are not compressed much, very open and glassy. Kind of a overdrive sound more than the compressed fuzzy sound. Much louder and harder to control, feedback alot. A very unique sound compared to the others. I would have to get used to them.
The ARS, Sovtek and the EH are almost identical. Very ringey in the cleans, with a more full range. When distorted they compress and are fuzzy and very driven. Easy to play and sustain notes. I actually liked the ARS & Sovteks the best for what I'm wanting from this amp.
Interesting test, I wanted to see if I could hear the difference and are the Mullards actually different from the rest of the pack, enough to warrant the money. I can say they are different, not sure in a way that I would like. Though I think I will hunt for a pair to have if I want to try that sound.
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ChrisL
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« Reply #1 on: December 09, 2007, 11:36:50 PM »
What pre's you were using?  I assume you were NOT biasing at 3ma.
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DaGlenster
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« Reply #2 on: December 09, 2007, 11:55:04 PM »
Yes, sorry 30ma biasing for all. Recommended by Nik.
As for pre's, 12ax7's. An RCA in 1, Sovteks in 2 & 3. I used the same pres for all the tests. I just pulled them out of the bag randomly as I did for the ARS EL34's when the amp first arrived and hey sound great. And the ARS's happen to match when biased.
I also played the same thing for each of the tests. Cleans I used an open chord thing I came up with and for the distored I used the melody to Jing Chi's 'That Road'.
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« Reply #3 on: December 11, 2007, 03:57:32 AM »
when you say tesla, do you mean JJ or the old ones from the 70's?

I've been wondering how the teslas would sound in mine
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DaGlenster
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« Reply #4 on: December 11, 2007, 05:01:40 AM »
I think they are older ones. I don't know the exact age. They are ARS Tesla Van Nuys, CA EL34's. They sound great. The pair I have just happens to match when biased. They compress and really drive when overdriven, a bit fuzzy but in a good way.
I use a Trainwreck ZAirBrake to atenuate and I should have tried the Mullards with that, they may have been more playable atenuated.
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« Reply #5 on: December 12, 2007, 03:55:36 AM »
I checked, and I think those are JJ's (the new production ones)

I currently have GT mullard re-issues and chinese 12AX7's in mine. Have you tried any 6ca7's in yours?
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DaGlenster
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« Reply #6 on: December 13, 2007, 01:00:36 PM »
I have not tried any 6ca7's. I think the best of the bunch were the Sovtek's to my ears. But I am going to look for some Siemens and I'll look for those also.
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DaGlenster
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« Reply #7 on: December 29, 2007, 09:02:50 PM »
I got a pair of NOS Siemens EL34's for xmas, yes I am that big of a geek (tubes for xmas, shameful I know...). So, I got some time to test them out. Not as elborate as the 1st test but I think the Siemens are the ticket. I ran the Telsa's and got used to them, then I switched themout for the Siemens.
The Siemens are very compressed and give me that tubey violin sustain that this amp gives so well but are smoother in character than the Telsa's and the other standard EL34's (sovtek & EH). I think the Siemens are going to be the goto tube for this amp. I got the compressed huge sustain when driven and enough ring when clean but the overdriven sound was smooth and detailed. The cleans are a bit mid rangey, not as much ring and shimmer but still nice and can breakup and bite when I picked hard. So far the Siemens are the best of the bunch for this amp.
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radiohead, lol
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« Reply #8 on: December 31, 2007, 11:54:58 PM »
nice

i am a geek too, i got a pair of sylvania 6ca7's....they are going to go in my expression VERY soon.
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DaGlenster
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« Reply #9 on: January 02, 2008, 02:37:21 AM »
I need to try some CA7's also. A friend just got a Sano amp (60's Ampeg spinoff) with a pair of old CA's in it. I may try thoose and see what  happens. I do get a swishing noise  (almost like a flanger is running) when I'm running things hot, have you had any thing like that? I don't think it's output tube related, but the better tubes lessen it. I am going to try moving wires around and changing input tubes.
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Roe
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« Reply #10 on: January 07, 2008, 05:11:46 PM »
I'm using sylcanias. sound bright, clear and less compressed than the el34s.
I bias a -30v at pin 5 (like ken fischer recommended) and at 49ma at pin8
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radiohead, lol
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« Reply #11 on: January 09, 2008, 01:45:40 AM »
Quote from: DaGlenster on January 02, 2008, 02:37:21 AM
I need to try some CA7's also. A friend just got a Sano amp (60's Ampeg spinoff) with a pair of old CA's in it. I may try thoose and see what  happens. I do get a swishing noise  (almost like a flanger is running) when I'm running things hot, have you had any thing like that? I don't think it's output tube related, but the better tubes lessen it. I am going to try moving wires around and changing input tubes.

oscillation you mean?

that's a bit strange. I've run some EH 6CA7's at about 42-ish mA (I know, I know...just was curious how it would affect the tone) and had the amp running for quite a while like that without any weird noises or any issues. Running flat out, also.
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DaGlenster
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« Reply #12 on: January 24, 2008, 03:13:21 AM »
As I understand it, the higher the Ma you bias the more headroom you'll gain. Higher bias tends to give a cleaner sound. I've been so swamped, NAMM and a Vintage show that I have negelected to get back to discovering the oscillation I'm getting. Something is weird. I may email Ceriatone and ask for suggestions.
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