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Old 19th March 2009, 08:39 PM   #1
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Default Best 300B amp schematics

Got a friend with contacts with a transformer producer
Plan to build THE BEST 300B amp
Anyone having the good ideas ?
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Old 19th March 2009, 09:24 PM   #2
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Hi, and welcome to the forum!

Apparently you do already have the transformer winder, but are his transformers as good as THE BEST 300B OPT in the world?

I am curious what other people's opinion is about your question!

Erik
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Old 19th March 2009, 09:26 PM   #3
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Personally, I dont think there is such a thing as a 'Best Schematic for 300B'.....

Each designer will think that his design is the 'best'

What is best??--For you, one design may sound 'Best' but same design to me,- may sound crap!

Too subjective an issue....

As to Transformer winding/construction, a Good S.E. Output Transformer is VERY different from a power-transformer--not trying to dampen your enthusiasm, but a Co used to making power/mains transformers may have no clue how to make a Good SE Transformer--they are completely different....
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Old 19th March 2009, 09:57 PM   #4
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You don't state if you need push pull because of the power factor.

So we'll assume SET.

Best I've heard out of all the things I've tried out is 10Y into 10Y into 300b. If you can get good transformers, then get something like two LL1660/10mA - one after the first 10y and one after the second.

you will be all trsanformer coupled and clean as hell. Detail with surprise you. the timbre of instruments will astonish you. The delicacy of the treble will enchant you.

You won't need to go roaming in Slottsparken at nights - you will just stay at home with an insane grin on your face. Gradually you will cease going out at all. You will forget about being samfundsbevisst. You will forget about samfund in general. You will be discovered in 70 years time still grinning.

andy
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Old 19th March 2009, 10:08 PM   #5
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I don't know what would constitute the best, but here are three intellectually interesting designs that are not just a 6SN7 SRPP cap coupled to a 300B.

http://electra-print.com/300bdrd.php
http://nutshellhifi.com/IT-Triode-Amp.gif
http://tubelab.com/TubelabSE.htm
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Old 20th March 2009, 12:30 AM   #6
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Quote:
Best I've heard out of all the things I've tried out is 10Y into 10Y into 300b. If you can get good transformers, then get something like two LL1660/10mA - one after the first 10y and one after the second.

andy [/B]

Andy do you happen to have a simplified schematic? I've collected my stash of 210 tubes and want to try this exact configuration. What did you use for plate / bias voltages, etc? OPT impedance suggestions? 3K, 5K? Lundahl as well?
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Old 20th March 2009, 12:44 AM   #7
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I never heard a 300B amp I liked until I heard one with an Onetics OPT.... it sang like a songbird

Who retails Onetics though?

Cheers!
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Old 20th March 2009, 12:57 AM   #8
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by Geek
I never heard a 300B amp I liked until I heard one with an Onetics OPT.... it sang like a songbird

Who retails Onetics though?

Cheers!

ask Yves for right iron drek ........

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Old 20th March 2009, 12:59 AM   #9
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Quote:
Originally posted by Zen Mod
ask Yves for right iron drek ........


For those that don't know his site:
http://www.dissident-audio.com

Cheers!
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Old 20th March 2009, 03:00 AM   #10
JoshK is offline JoshK  Canada
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Quote:
Originally posted by Geek
Who retails Onetics though?
Why Onetics does....call Bud Purvine and order direct, that is how you get Onetics. He is a good guy to chat with too.

Josh
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