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Old 6th March 2009, 04:34 PM   #1
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Question What circuit and tube to be used

Hi All,

Can anyone give me a suggestion about my second hand o/p transformer is single-ended around 20W and Z=1K , which kind of power tube should be used and what kind of circuit suit for it ?

CK
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Old 6th March 2009, 05:27 PM   #2
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HI CK
Please help me by providing the specifications for the transformer. Also Manufacturers name, model number. I need more information to get started. With this information provided you are much more likely to get suggestions. Also good luck with the project.
Bob
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Old 6th March 2009, 05:43 PM   #3
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Are you thinking about an instrument (guitar) amplifier?

Most people prefer matched O/P transformers for Hi-Fi.

w
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Old 7th March 2009, 01:14 AM   #4
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Thanks to your questions.

Sorry, they are second hand o/p dismantle from PWR amp also they are not a commercial product. Seems a DIY thing made in China / Taiwan with an external iron box enclosed.

I want to make a single-ended PWD amp around 10W.

There is some description

Primary :
Red color wire connected to transformer with "B" marking
Yellow wire connected to transformer with "P" marking

Transformer body :
Have string "LM-1K-25F" & Zp : 1Kohm

Secondary :
Have 4 wire marked as 0 / 4 / 8 / 16 ohm
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Old 7th March 2009, 12:48 PM   #5
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Hi!
If You'l build SE aprox. 8-10 wts, You can use russian 6S41S - Ri=300 ohm /6С41С/ with Ia= 100-120 ma, and wire diameter primary coil must be aprox. 0.3 mm!!....Or
2 parallel 6S19P - Ri=150 ohm /6С19П/, with Ia=60 ma each,
or 2 par. ED8000 - http://www.tubedepot.com/nos-ed8000.html
Preamp. EF861, E180F. If You interest, I can give You a schematic - 6S41S & EF861 !
But first, You must measure wire diameter!!
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Projects: OTL-OCL 6AS7 Gen. Electric, SEs 2A3 RCA, 300B JJ, 6S4S, 4P1L, EL11 Telefunken, 6AS7 RCA, 6S33S, 6S41S, 6S19P, E84L Siemens, E236L Telefunken, headphone ampl. OTL Loftin White 6AS7 RCA,... PPs 6005 Gen. Electric, EL34 Mullard, 6L6....
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Old 7th March 2009, 02:13 PM   #6
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However, I had already bought this pair of output transformer. Not sure they suit for your power amp circuit ?

This is there descriprtion

Primary :
Red color wire connected to transformer with "B" marking
Yellow wire connected to transformer with "P" marking

Transformer body :
Have string "LM-1K-25F" & Zp : 1Kohm

Secondary :
Have 4 wire marked as 0 / 4 / 8 / 16 ohm
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Old 7th March 2009, 02:39 PM   #7
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You can try 2 of ED 8000 or 6S19P, Ia=80-90 ma per channel, and EF861.
It's will be OK.
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Projects: OTL-OCL 6AS7 Gen. Electric, SEs 2A3 RCA, 300B JJ, 6S4S, 4P1L, EL11 Telefunken, 6AS7 RCA, 6S33S, 6S41S, 6S19P, E84L Siemens, E236L Telefunken, headphone ampl. OTL Loftin White 6AS7 RCA,... PPs 6005 Gen. Electric, EL34 Mullard, 6L6....
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Old 7th March 2009, 03:00 PM   #8
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can you send their 8000 and 6S19P circuit for my reference ?
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Old 7th March 2009, 08:26 PM   #9
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OK! I will....
You also can use 6P45S /6П45С/ - Ri=200 ohm, Ia=80-90 ma.
Very linear tube for TV and Hi-End !
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Projects: OTL-OCL 6AS7 Gen. Electric, SEs 2A3 RCA, 300B JJ, 6S4S, 4P1L, EL11 Telefunken, 6AS7 RCA, 6S33S, 6S41S, 6S19P, E84L Siemens, E236L Telefunken, headphone ampl. OTL Loftin White 6AS7 RCA,... PPs 6005 Gen. Electric, EL34 Mullard, 6L6....
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Old 8th March 2009, 05:09 PM   #10
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You have an Email....
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Projects: OTL-OCL 6AS7 Gen. Electric, SEs 2A3 RCA, 300B JJ, 6S4S, 4P1L, EL11 Telefunken, 6AS7 RCA, 6S33S, 6S41S, 6S19P, E84L Siemens, E236L Telefunken, headphone ampl. OTL Loftin White 6AS7 RCA,... PPs 6005 Gen. Electric, EL34 Mullard, 6L6....
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