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Dynaco PAS 3x Quad Cap and ticking sound
Dynaco PAS 3x Quad Cap and ticking sound
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Old 13th September 2018, 03:12 PM   #1
jimmeq is offline jimmeq  United States
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Default Dynaco PAS 3x Quad Cap and ticking sound

I'm a noobie to rebuilding and have started with a Dynaco PAS 3X. It was working but not sounding good so I began changing one part at a time. So far I've replaced the rectifier and the caps under it, the transformer and recently the Quad Cap. I got it from DynakitParts.com- a 30-20-20-20. I also replaced the 47K and two 10K resistors at 1/2 W that are soldered to the cap.

When I turn on the amp, after about 10 seconds I hear a slight *tick* sound and the power indicator light bulb flickers.

Should I have used 1W resistors?
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Old 13th September 2018, 03:55 PM   #2
J247W is offline J247W  United Kingdom
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Quote:
Originally Posted by jimmeq View Post
I'm a noobie to rebuilding and have started with a Dynaco PAS 3X. It was working but not sounding good so I began changing one part at a time. So far I've replaced the rectifier and the caps under it, the transformer and recently the Quad Cap. I got it from DynakitParts.com- a 30-20-20-20. I also replaced the 47K and two 10K resistors at 1/2 W that are soldered to the cap.

When I turn on the amp, after about 10 seconds I hear a slight *tick* sound and the power indicator light bulb flickers.

Should I have used 1W resistors?
Sounds like you have not soldered something properly, check the soldered joints under a "magnilamp" if you have one ? try to wiggle the components to see if anything moves, but with power off or course.

Check the components you have replaced are the right impedance as well.

Regards

J247W
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Old 13th September 2018, 05:34 PM   #3
dtaylo3 is offline dtaylo3  United States
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I would recommend going to Triode Electronics Home Page and World HQ and getting the Sheldon Stokes board/kit for upgrading power filtering, etc. It removes the selenium rectifier, quad cap, puts in a necessary fuse, improves the capacitor filtering, etc.
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Old 14th September 2018, 04:02 PM   #4
jimmeq is offline jimmeq  United States
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Thanks for the help! Very much appreciated. I make one change at a time just so when something like this happens it's easier for me to try and figure it out. And then there are often those times I can't... I do have a magnifying glass and a bright light....

I'm only replacing the old parts trying to stay with as much of the original design as I can.
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Old 28th September 2018, 08:13 PM   #5
jimmeq is offline jimmeq  United States
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Damn! I re soldered all connections and resistors to the quad cap. Then replaced the PC 5 & 6 boards I got from Erhard Audio, and still hear the ticking.

After reading the Bill Thompson Dynaco PAS3 rebuild article I have discovered the tick sound occurs only when the rectifier tube is plugged in. The tube fit is not snug; seems a little loose. I actually have two rectifier tubes and they both tick.

This noob is really baffled now. Any suggestions?
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Old 28th September 2018, 08:17 PM   #6
jimmeq is offline jimmeq  United States
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Quote:
Originally Posted by dtaylo3 View Post
I would recommend going to Triode Electronics Home Page and World HQ and getting the Sheldon Stokes board/kit for upgrading power filtering, etc. It removes the selenium rectifier, quad cap, puts in a necessary fuse, improves the capacitor filtering, etc.
This might be an option although I'd like to fix the current tick issue first. A good exercise for me while learning. Also, the directions to place the power supply in the Dynaco are not simple enough for me. Is there a beginners gudie for it? Thanks!
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Old 28th September 2018, 09:25 PM   #7
rayma is offline rayma  United States
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Quote:
Originally Posted by jimmeq View Post
Damn! I re soldered all connections and resistors to the quad cap. Then replaced the
PC 5 & 6 boards I got from Erhard Audio, and still hear the ticking.
Could be the power transformer, if you've replaced the quad cap and rectifier.
If the noise happens when the power is off, replace the capacitor across the power switch.
Those ceramic capacitors with line voltage on them can sometimes make odd noises.

Last edited by rayma; 28th September 2018 at 09:44 PM.
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Old 28th September 2018, 10:41 PM   #8
dtaylo3 is offline dtaylo3  United States
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You could try going to solid state rectification instead and see what happens. I would read the Sheldon Stokes notes on his board as it addresses some power supply issues as well as fusing.
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Old 28th September 2018, 11:14 PM   #9
rayma is offline rayma  United States
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Quote:
Originally Posted by dtaylo3 View Post
You could try going to solid state rectification instead and see what happens.
I would not recommend this for a beginner, at least at this time.
Two preamp rectifier tubes in a row aren't going to do this, and
in fact I've never seen one do that, out of hundreds. The problem
is something else.
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