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Multi tubes amps what effect does each has?
Multi tubes amps what effect does each has?
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Old 13th February 2018, 09:28 PM   #1
raybies is offline raybies  Australia
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Default Multi tube amps what effect does each have?

If a tube amp has say:
300B x 2 (only these have a bias dial)
6N8P x 2
12AT7 x 2
5Z3P x 1 (rectifying tube)
  1. What effect would changing each have to an equivalent model in a different brand? Like say 12AT7 PSVane to Genalex?
  2. Which would have the biggest change?
  3. Would they all need to designed to work with each other?

Thanks, I'm a tube n00b, and couldn't find the answer.

Last edited by raybies; 17th February 2018 at 09:36 PM.
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Old 13th February 2018, 09:43 PM   #2
Lingwendil is online now Lingwendil  United States
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Multi tubes amps what effect does each has?
If competently designed there will be little to no change other than very slight operating points.
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Old 13th February 2018, 09:46 PM   #3
Eli Duttman is offline Eli Duttman  United States
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What you describe is known as tube rollling. While there is no guarantee, "rolling" the small signal tubes rates to yield the biggest change. For instance, you could replace the Chinese 12AT7s with NOS Mullard CV4024s. The 6N8P seems to be a 6SN7 "equivalent". New Sensor's "reissue" TungSol is worth trying. Desirable old stock 6SN7 variants command silly prices.
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Old 13th February 2018, 10:25 PM   #4
raybies is offline raybies  Australia
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Thanks, so there are no rules on effect.
Eg: changing the 300B's to Genalex will increase dynamic range slight; > output power...

Or change tube X affects mids...
What if tubes are bypassed electrically?

Why would one change the 12AT7's if I don't know what the outcome will be? change until it breaks or if it ain't broke, don't change it.
I mean the above with utmost respect, but I would like to learn without blowing money.

I can't find the link now, but last week I read this guy tube rolled a whole bunch of 300B's and the difference in out put was described in very colorful terms... like tube X was flat and boring, tube Y was dynamic and engaging with very deep lows and bright highs; was the dude tripping?

Also some dude with my amp on utube said it was crap until he changed the tubes... I asked him which tubes he replaced > no reply.

Any insights people have I would appreciate, again I'm a tube n00b so if this question has bagged like audio cables and motor oil... sorry.
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Old 13th February 2018, 10:38 PM   #5
aardvarkash10 is offline aardvarkash10  New Zealand
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you will hear exactly what you spend and expect. Note my signature line - it holds.

As you have noted, some people have very colourful imaginations. The only alternative (and arguably more charitable) interpretation is that their amplifier is incompetently designed and built.
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Old 13th February 2018, 11:09 PM   #6
Eli Duttman is offline Eli Duttman  United States
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Old 14th February 2018, 12:12 AM   #7
raybies is offline raybies  Australia
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OK found the article... Triode Roundup: Seven “Common Man” 300B Tubes Compared | Wall of Sound | Audio and Music Reviews

Is he trippin, on the money or a paid reviewer?
If I were to just roll out the 300B would I notice the difference or would I also need to roll out the other tubes?
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Old 14th February 2018, 01:10 AM   #8
raybies is offline raybies  Australia
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Additionally what role does each set have.
So I believe:
1.- 300B's are Output tubes.
2.- 6N8P Preamp tubes?
3.- 12AT7 ???
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Old 14th February 2018, 03:18 AM   #9
aardvarkash10 is offline aardvarkash10  New Zealand
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Quote:
Originally Posted by raybies View Post

Is he trippin, on the money or a paid reviewer?
If I were to just roll out the 300B would I notice the difference or would I also need to roll out the other tubes?
You will notice differences. Whether they are there or not, you will still notice them.

M2CW, WoS is FoS. But at least his disclaimer is honest.

Quote:
Originally Posted by raybies View Post
Additionally what role does each set have.
So I believe:
1.- 300B's are Output tubes.
2.- 6N8P Preamp tubes?
3.- 12AT7 ???
Without a diagram hard to say, but probably 1 = outputs, 2 = drivers and 3 = voltage amp/phase splitter
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Old 14th February 2018, 04:17 AM   #10
raybies is offline raybies  Australia
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Quote:
Originally Posted by aardvarkash10 View Post
Without a diagram hard to say, but probably 1 = outputs, 2 = drivers and 3 = voltage amp/phase splitter
I found this

Click the image to open in full size.
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