12AX7-6SN7 Preamplifier - diyAudio
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Old 10th March 2010, 03:37 PM   #1
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Default 12AX7-6SN7 Preamplifier

Twin Audio 12AX7-6SN7 preamplifier
This is our own preamp circuit which designs to combine 12AX7 and 6SN7 in one preamp and with 6X5 rectifier and 6SN7 regulation.

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Old 11th March 2010, 02:11 AM   #2
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12AX7 twin triode SRPP circuit.

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Old 11th March 2010, 04:04 PM   #3
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Power section of the preamp.

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Old 11th March 2010, 04:09 PM   #4
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Two inputs and one output.

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Old 11th March 2010, 04:16 PM   #5
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Obony chassis, nice wood texture.

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Old 11th March 2010, 04:17 PM   #6
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GE 6X5 rectifier.

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Old 11th March 2010, 04:19 PM   #7
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High quality CMC bakelite tube sockets.

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Old 11th March 2010, 04:20 PM   #8
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Inside view:

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Old 11th March 2010, 04:24 PM   #9
Zen Mod is offline Zen Mod  Serbia
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great looking ;

but - why - on earth - you are using ECC83 in line stage ?
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Old 11th March 2010, 04:42 PM   #10
kevinkr is offline kevinkr  United States
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Hint: Try 6SN7 in SRPP for line stage... I found it to be quite nice despite the mis-application. (Have built several as long as 10yrs ago, have one now for back up to my 26DHT PTLT)

I went through a dubious phase of using SRPP with 12AX7, whilst it sounds ok, the actual output impedance of this combination is >10K, not great for driving anything but a CF IMHO..

A gain of 20dB or less is generally more than adequate for a line stage, and an SRPP connected 6SN7 will give you that with an output impedance of around 1K.
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