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Old 27th May 2018, 06:30 PM   #11
Zen Mod is offline Zen Mod  Serbia
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B1 Xformer
Quote:
Originally Posted by Nelson Pass View Post
Performance aside, the Edcor does not have the separate coils needed.
that , taking F6 in account

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Last edited by Zen Mod; 27th May 2018 at 06:33 PM.
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Old 27th May 2018, 06:32 PM   #12
needtubes is offline needtubes  United States
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Originally Posted by vdi_nenna View Post
$5 less than Jensen.
In fact, you can get high-nickel (80%) Cinemag CMOQ-4H for less than the Jensen JT-123.
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Old 1st November 2018, 12:56 PM   #13
Skorpio is offline Skorpio  Denmark
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Originally Posted by vdi_nenna View Post
Can we start a dialog on the B1 Xformer preamp? Does it fall under some other existing/similar design, so it's not being discussed?

From BAF 2017.
The switch selects between 6 or 12dB gain. If I want a 3 step switch and the 3. position to be 0dB, then all the transformers windings in series will be parallel with the output...will this be a problem for B1?
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Old 1st November 2018, 02:07 PM   #14
vdi_nenna is offline vdi_nenna  United States
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B1 Xformer
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3 step switch and the 3. position to be 0dB, then all the transformers windings in series will be parallel with the output
Go out the third switch position to bypass the transformer. Maybe add an extra set of outputs for 0db (buffered out) or not.
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Old 14th March 2019, 02:07 AM   #15
Soundhappy is offline Soundhappy  France
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Who have tried building one?
Maximum performance from minimalistic circuit
Trimmer allows use of not very close matched complementary jfets pairs.
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Old 14th March 2019, 02:27 AM   #16
twitchie is offline twitchie  Canada
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B1 Xformer
Default DEFiSIT front end

Isn't it the same as the DEFiSIT front end from BAF2017 minus the bias bits?

and ignoring the coupling caps
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Last edited by twitchie; 14th March 2019 at 02:29 AM. Reason: ... coupling caps
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Old 14th March 2019, 03:18 AM   #17
Soundhappy is offline Soundhappy  France
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PSU have V(-) , GRD and V(+) high probability buffer are similar to this one..
Two first B1 Xformer resistors around the switch are 1M Ohm's.
After the switch log volume potentiometer of 50K maybe..
Schematic source : Passworks
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Old 14th March 2019, 04:11 AM   #18
Soundhappy is offline Soundhappy  France
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Or something similar to M2 buffer.btw is nice low distortion preamp. Schematic source : First Watt
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Old 14th March 2019, 04:43 AM   #19
PRR is offline PRR  United States
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Originally Posted by twitchie View Post
...same as the DEFiSIT front end ...
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Old 14th March 2019, 07:20 AM   #20
Zen Mod is offline Zen Mod  Serbia
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B1 Xformer
Quote:
Originally Posted by Soundhappy View Post
Who have tried building one?
Maximum performance from minimalistic circuit
Trimmer allows use of not very close matched complementary jfets pairs.


What's wrong with the kiss,boy ?
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