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Old 18th August 2017, 03:40 PM   #11
hpeter is offline hpeter  Slovakia
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845 spud?
whole thing gain too low to use ..?
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BLOG. XMOS_U8/PCM5102A > LL1544A > 6H9C+gyrator > 2A3_SOV/JJ > LL1660 > STAX SR207 _ SR L300 _ SR007 # LL2748 > 394A > LC 12H/1000µ
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Old 18th August 2017, 04:44 PM   #12
Soundhappy is offline Soundhappy  France
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Quote:
Originally Posted by hpeter View Post
845 spud?
whole thing gain too low to use ..?
Yes you are right.
Schematic only are very " Spud " style with his R input and his dedicated psu.
Second one is the driver stage with cool switch feature if you want try different tubes . Thanks for correction !
My question : could we build 845 , 211 SET output stage like this but on place of next tube
gain stage use autoformer passive gain stage ?
Challenge is to use only one triode without other active gain components.
Something " Spudish " like but not pure Potato amp.
Anyway bear with me
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Old 18th August 2017, 09:48 PM   #13
famousmockingbird is offline famousmockingbird  United States
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Fahk yes!!

Thanks for the schematics
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Old 18th August 2017, 10:28 PM   #14
Soundhappy is offline Soundhappy  France
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On some rare of the above schematics we don't have all components parameters.
Happyly with component reference on the web we can find all informations.
Just say if you need available equivalent from your local USA or Europe distributors.
Example PMC-518H show is 5H, 180 mA, DCR93 Ohm
Nice
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Old 18th August 2017, 10:55 PM   #15
famousmockingbird is offline famousmockingbird  United States
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Roger that
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Old 19th August 2017, 07:00 AM   #16
hpeter is offline hpeter  Slovakia
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Quote:
Originally Posted by Soundhappy View Post
My question : could we build 845 , 211 SET output stage like this but on place of next tube
gain stage use autoformer passive gain stage ?
been thinking about phono pre, with jfet followers driven with step ups (transformer only gain)

but 845/211, mind the tube miller C, that will load too much the stepups. (strong treble roll off)
(turns ratio= ^2 impedance ratio )
you will need to add fet follower in front of tube grids -- that maybe will decrease this problem
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Old 19th August 2017, 07:29 AM   #17
JPS64 is offline JPS64  Germany
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@soundhappy

Reihe M55

JP
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Old 20th August 2017, 03:36 PM   #18
Soundhappy is offline Soundhappy  France
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Few DIY articles are for advanced builders and with exotic tubes and transformers
for example this sensei Sakuma Susumu preamplifier

http://www43.tok2.com/home/temasumo/...mp_SakumaS.pdf

but many of the presented projects use wildly available components.
Few my second hand bulky paper old magazines are from 1974 !
Now we can read them on Kindle tablets and be busy and inspired
with digital versions of diy audio vacuum tube knowledge work preservation.
Thanks again to OLD RADIO BOY from Japan
どうもありがとうございます
Domo arigato gozaimasu
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Old 20th August 2017, 03:52 PM   #19
Jsixis is offline Jsixis  United States
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Default google translate very nice

Quote:
Originally Posted by Soundhappy View Post
Lucky i was to see such extraordinary DIY projects archive with vacuum tubes i share this treasure with all forum members.
Infinite THANKS for hobby amateurs in Japan who patiently scan this MJ magazine articles over the years.
Every month we get new ones available on line in pdf format
lot's of OTL amplifiers , Sakuma San articles
Et cetera

Please enjoy & respect this precious library

click on direct link Schematics Treasures

どうもありがとうございます
Domo arigato gozaimasu
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Old 20th August 2017, 04:47 PM   #20
Soundhappy is offline Soundhappy  France
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Thanks Jsixis first post updated with menu translation in English
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Last edited by jazbo8; 27th August 2017 at 07:06 AM. Reason: spelling
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