My New Early Model PL400 w/ 4 Fin Heat Sink

Fishoz said:
Yup...a 400 is plenty for some (satisfied here)....maybe if I were younger I'd go for a 700. Too much time left on Lee's lifetime warranty to give up my 400 though. The 400 has kept me smiling for almost three years now.
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Let's hope I live long enough for you to collect on that warranty...
 
I still have a hard time visualizing a 17 watt single ended, triple triode, double pentode tuber as being audio bliss.....
 
LOL no doubt. Sorry "toobers", but after working on AN/ARN-52 Tacan's chock full of tubes and becoming an alcoholic as a result... hehe. (Perry will get this.. I think he was clubbing seals while I went to DG aka the "rock")
 
Haaa...... You thought you were staying in San Diego Garcia (a Mexican suburb of San Diego).... Cocaine is one hell of a drug eh?

You talk about clubbing seals like it's a bad thing (I was clubbing penguins in New Zealand bro).....
 
We currently do not have the PL400 faceplates but will sometime in 2019. Working other priorities first but eventually we will have those.

We have the cap kits for the 4 fin amps. It is a single cap per rail (not the stacked cap) at 12KuF/100V that mount with the band clamps, We have the 50A bridge and the snubber caps. That 200V bridge is not a high enough voltage rating, need at least 400V for 120VAC in a PL amp. The current rating is fine but the Vrr is not.
 
Wanna read ? If you have time you could look at how I screwed mine up and just at the brink of insanity the guys here pulled me out. I could give you a few ideas and pictures of what I was told to do and it may well be helpful. Be quite careful with the bias transistor leads if they are mounted to the heat sink back panel on your amp. There are some diffrences between that 4 fin and my 8 fin and not just the amount of fins ...DC protect is a must unless you are going to put that am on a set of speakers that you care not a shit for. I used my stock main board but repopulated it with fresh caps and the double diodes . I changed out the main filters with White Oak. I am very happy with the result. You can always build another amp, a WOPL and use this one on a second system. You can never have enough amps, right ! The guys here are very helpful. You are in the right place to fix er up nice. Let me know if I can be of help.
 
I'm 7 pages of 14 into the thread about your 400. Going to hit the hay and finish tomorrow.
 
VSAT88 I finished reading about your trials and tribulations on getting your 400 running. I see where you say to be careful of the bias transistors. Hard to see the problem when it's broken off and appears that it's still connected.

Regarding my 400... I'm looking to put a Mouser order together and have a question about the C6 Diode Mod. I have a service manual from HiFi Engine. It doesn't seem to show my PCB parts outline. I believe the 100uF 10V parts indicated are the C6's for the left and right channel. Just looking for a little confirmation. Assuming I've identified the correct cap, what kind of replacement cap should this be audio, low leakage, general etc.? If it should be a low leakage or audio there's not much available in a axial configuration. Could I use a radial and just spread the leads out assuming they'll reach? Does that cause any problems with noise? On the diodes themselves, should be be configured as A or B as shown in the attachment or maybe some other way?

As always thanks for any help.

Alan

DSC_0232.JPG DSC_0233.JPG C6 Diode Mod.jpg
 
Configuration A. Yep, just spread the leads. I do that a lot on the 3300's to replace axials and have had no problems with it. Audio grade only, Nichicon "Muse" if you can get em.
 
Thanks Lee. Punchback what Lee said ! Your mainboard looks more like my PL 700 than my PL 400. My 700 is an early one and your 400 must have been built not too long after my 700. It goes without saying that I measured all the resistors on my board to make sure I was good there. The resistors on the back plane too. There were some out of spec on the back plane. I expected that so they were replaced as well. Hope you ordered 100V + Main Filters and a new BR.
 
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