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Dynaco PAT 4 restoration

jFF_Bulbo

jFF_Bulbo

Active Member
Hello.
Recently i bought a Dynaco PAT-4 preamplifier. It needs a lot of love. It was complete, frontal panel in mint condition, but teh cover and the back will need a lot of love.

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I decided to restore it. I am not technician in this arts (i just learned to solder....). A few time ago a good men at Updatemydynaco.com send me the pair of knobs the unit came without. Well i have no tested yet, it was sold to me untested. I decide to replace the RCA conectors in the back, all of them was stained. I remove one by one from the baquelite board and replace only the external contact. Hard job. Photo attached
fanbrp.jpg

The photo shows the replacement process. The brilliant RCAs are the new. The other are the unit come with. It was for vanity, i have to admit. For now, my dynaco pat-4 is protected by a shoe box... LOL

Well. I am trying to find the specs for the power transformer in order to get one ins case it were necessary. I couldn't find the info. Does anyone knows the technical data for this power transformer?
Al last, i could be interested in replace it with a toroidal transformer, but i'll need the specs to order the manufacture of a transformer or to try to find one which matches.
 
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Did you replace all the aging parts on the circuit board too. Do you have photos of inside and outside restored? Does it sound better?
 
lightcapture said:
Did you replace all the aging parts on the circuit board too. Do you have photos of inside and outside restored? Does it sound better?
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Hello. Nop. I think l'll do it in the near future, for now, just cleaning pots, desolder an re soldering the conections in power section in order to make it works. in fact, i never have heard the PAT-4 working. It was sold to me as a parts/refactions supplier, but i saw it complete (except for 2 knobs) and i assume i could restore it. I am not technician. just a padawan in vintage audio fixing. More photos in the next hours. Regards.

-i'd like to invite you to visit updatemydyanco.com. it seems there too many option to make your PAT4 sounds like the first day it was plugged -or even better-, For my is complicated due to i am in Mexico and the shipping cost almost duplicate the cost of the pieces (teh power trnaformer for example.....)
 
You will find several web sites selling various upgrades for the PAT 4. Everything from power supply, upgraded parts kits and simple mods to make them sound better. I have one as well in need of much love. The tone pots were gone, random wiring gone or cut and a damaged selector switch. I was able to find NOS tone controls, not easy and even a selector switch. There are even reproduction RCA jack plates available. It's a back burner project. Others to finish first.:biggrin: Good luck with yours! You can download the manual for free at hifiengine.com. since these were kits its an assembly manual. Step by step. Pretty easy when rebuilding one.
 
Lavane said:
http://conradhoffman.com/PAT4.htm take a look here. You can order parts in Mexico I assume. Make a list of parts from what's on the boards or from the manual. On this web page it also lists some simple easy mods that will improve.
Click to expand...
Thank you. I have visited it already. First i will make the PAT-4 works properly. If i notice noise, hum scrathes i will fix it -or update it-. For now pray for my Dynaco.
 
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