dynaco PAT4 modifications

mr2racer · 26th October 2011, 01:44 AM

Does anyone here have any ideas for Dynaco PAT4 modifications?

ticknpop · 26th October 2011, 03:30 AM

Use the chassis for a Pass Diy preamp. It would cost more to update the Pat 4 and it still wouldn't compare with any decent current DIY design. The Pat 4 topology is too dated to be worth the effort to replace the caps and resistors with new ones.

djoffe · 26th October 2011, 04:36 AM

Here's a link to an article with PAT-4 mods suggested by Von Alstine. The PAT-4 mods begin on page 29:

http://avahifi.com/images/avahifi/ro...pdf/ab1986.pdf

This link was suggested to me by one of my customers who purchased my Stereo 120 upgrade kit

Update My Dynaco

jsfinusa · 26th October 2011, 09:54 AM

I am working on a PAT-4 rebuild using an ESP P88, with new power supply, switches, controls, and connectors. I do not require a phono preamp so that piece is omitted. The chassis is somewhat small but I can fit the new parts and have some room left over for future additions or changes. If you need any original electronic PAT-4 parts, let me know. I am only using the chassis and a few mechanical parts from the original preamp.

26th October 2011, 01:44 AM	#1
mr2racer diyAudio Member Join Date: Jul 2009	dynaco PAT4 modifications Does anyone here have any ideas for Dynaco PAT4 modifications?

26th October 2011, 04:36 AM	#3
djoffe diyAudio Member Join Date: Oct 2008	Von Alstine Mods Here's a link to an article with PAT-4 mods suggested by Von Alstine. The PAT-4 mods begin on page 29: http://avahifi.com/images/avahifi/ro...pdf/ab1986.pdf This link was suggested to me by one of my customers who purchased my Stereo 120 upgrade kit Update My Dynaco

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26th October 2011, 03:30 AM	#2
ticknpop diyAudio Member Join Date: May 2005 Location: toronto	Use the chassis for a Pass Diy preamp. It would cost more to update the Pat 4 and it still wouldn't compare with any decent current DIY design. The Pat 4 topology is too dated to be worth the effort to replace the caps and resistors with new ones.

26th October 2011, 09:54 AM	#4
jsfinusa diyAudio Member Join Date: Jun 2011	I am working on a PAT-4 rebuild using an ESP P88, with new power supply, switches, controls, and connectors. I do not require a phono preamp so that piece is omitted. The chassis is somewhat small but I can fit the new parts and have some room left over for future additions or changes. If you need any original electronic PAT-4 parts, let me know. I am only using the chassis and a few mechanical parts from the original preamp.

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