Pre Amp?

a DIY, modified Mullard 5-20 monoblock design

Postby Shannon Parks » Thu Jun 21, 2007 7:04 pm

HOGHEAD wrote:Any word on a pre amp?


Hi Hoghead,

The get*set*go boards are available ($49 like everything else). You could glom the circuit from Gary Kaufman's 6SN7 preamp and just omit the cathode follower. The get*set*go power circuit could remain the same. Whadaya think?
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Postby HOGHEAD » Thu Jun 28, 2007 7:15 am

I would be interested, what else can you tell me about the design, any photos and have you built one? Jim
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Postby HOGHEAD » Tue Aug 14, 2007 12:03 pm

Shannon, you said the boards were ready? I would like to buy one as I don't have a preamp anymore and need one, Let me know, Jim
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Postby jlaney » Tue Aug 14, 2007 10:18 pm

I rebuilt a PAS3 using an article in Audio Amateur from 4/82 called "The Last PAS" by David Vorhis. The mod converts the linestage to a single stage of amplification direct coupled to a cathode follower, and bypasses the tone controls. It is built on the stock circuit board. There is also an option to add a regulated power supply, but I kept mine pretty much stock.

I've been very happy with this preamp.
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Postby Shannon Parks » Wed Aug 15, 2007 6:19 am

HOGHEAD wrote:Shannon, you said the boards were ready? I would like to buy one as I don't have a preamp anymore and need one, Let me know, Jim


Hi Jim,

I've got one HERE.

Once again, this would be an semi-undocumented mod. I would suggest the Gary Kaufman 6SN7 preamp design with the getsetgo, minus the second half cathode follower. So it would be a simple 6SN7 gain stage with a 6AX5 rectifier.
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