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Old 19th October 2011, 04:44 AM   #1
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Join Date: Feb 2011
Location: MN
Default B1 Tape Loop

I would like to build another B1 as my main preamp. I built my first with a minimalist approach, no input switching and using a stepped attenuator... it is first rate. The sound compares favorably with the best I have ever had in my system.
I need a buffered tape loop, what is the easiest and best way to incorporate this complication?
I'm thinking of adding a duplicate B1 circuit fed from the input and obviously bypassing the attenuator. Am I missing a better approach?
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Old 19th October 2011, 04:49 PM   #2
diyAudio Member
Join Date: Feb 2011
Location: MN
Default Attenuator Location in Circuit

To put it another way:
Does the attenuator have to be on the input side of the buffer?
Could I put it on the output side and take my buffered tape output just in front of it thus providing a line level out?
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Old 19th October 2011, 08:57 PM   #3
Itsmee is offline Itsmee  England
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1, Put the tape buffer in parallel with the B1.
2, Put the tape buffer in front of the B1, this has the advantage of buffering the attenuator input.

I would try 1, listen, then try 2, to see which is preferred, if it's a minor difference, I'd stick with 2.
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