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RE: Dynaco PAT 4

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In Reply to: RE: Dynaco PAT 4 posted by joetech on January 15, 2025 at 13:58:30

Welll Dyna co Pat 4 was in a word: Junk. The update my dynaco kits Works well. I did the fuyll Monte upgrade years ago. Made a big difference.
Don't bother with the Phono upograde one tho :-) A diy Le pacific standalone phomne is a whole planet better.
Seriously suggest doing the ~7$.. "Reduce PAT-4 Distortion by 10X (DRD4)-$7.00" FIRST as it makes THE biggest improvement.
... then... decide if you want to go further.
Don't waste time /$$ on NOS Potentiometers ..I did, and along with the NOS supplier discovered that the Seriously Low Quality pots Cheap Ass Dave Hafler
chose to use. Self deteriorate! ...sitting in sealed packagings.. on the parts shelf for 50+ years ! As in 'new' NOS proved worse than my used ones.. repeatedly !
That said; I replaced My'updated' Pat 4 with a Dact type stepped attenuator 20$ (Ali express) as passive pre..and a DIY 'Le pacific' Phono stage.
For sounds quality NO Dynaco /Hafler even approaches.. True.
Good luck.

Edits: 01/16/25 01/16/25

Follow Ups:

RE: Dynaco PAT 4 - mg16 08:23:08 01/16/25 (1)
Look for a Pat-5 bifet.
A very good sounding preamp for the money.
I owned at Pat-4.
When I built a Pat-5 Bifet kit, back in the 80's,(Bought from Stereo Cost Cutters), I became a believer in how much a preamplifier can affect sound quality.
Phono and line.
mg16
- Remember the origin of the PAT-5 BiFet? - E-Stat 13:22:26 01/16/25 (0)
  It was Frank Van Alstine at Jensen's Stereo who modified PAT-5s using lower noise RN60D resistors, tantalum and polystyrene signal capacitors, stiffened the power supply and...replaced the LM301 op amps with newer LF356 models which used a combination of bipolar and JFETs. Bypassed the tone control circuits altogether.
  I used one of his FET-5s in the late seventies replacing a Citation 11. Was pretty darn good but the SP-6 that followed was significantly better.
  There is a similar story to how Van Alstine modified the Stereo 400 into the Double Dyna which was later adopted by Dynaco as the Stereo 416 including the optional external capacitor bank for the power supply. I took that approach to an Audire power amp at the time with great results. Taught me a valuable lesson as to the qualitative and dynamic advantages of extremely stiff power supplies.
  
  Edits: 01/17/25

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