Phase Linear Model 300 Series Two overheating on one side at low volumes

[laatsch55]

Folks probably wouldnt like my response if their donation came with strings..

 

[jtatknox]

I'll try to ferret them out!

While I wait for parts... I am struggling with the binding posts. The holes are too narrow for 12 gauge wire and they don't seem to work w/ standard banana plugs or have room for most spade plugs. What's a good spade connector for this old style binding post?

 

[Skratch]

Why do you need 12 gauge wire ?

 

[jtatknox]

I don't, it's just what I've got lying around.

 

[laatsch55]

I've got K's and I run 10 ga.
JT, post a pic. It's been years since I worked on a 300. Rattle my memory here..

 

[NeverSatisfied]

I'll try to ferret them out!

While I wait for parts... I am struggling with the binding posts. The holes are too narrow for 12 gauge wire and they don't seem to work w/ standard banana plugs or have room for most spade plugs. What's a good spade connector for this old style binding post?

Are the binding posts different on a 300 compared to the others?
I use banana plugs on all my PL amps (400,700&D500) and I use 10 gauge wire.
12 gauge I consider the minimum and only for short runs.

 

[laatsch55]

Are they the locking type bananas Spencer??

 

[NeverSatisfied]

Are they the locking type bananas Spencer??

I prefer the straight barrel type. I bought a bunch of these on Amazon several years back and they can take up to 10 gauge.

 

[J!m]

Strip the wire and solder it direct to the binding post!

 

[NeverSatisfied]

Strip the wire and solder it direct to the binding post!

Well that is definitely one way to go. Lol

 

[J!m]

Low loss connections.

 

[Gepetto]

Buy some pins and solder them on the ends of your 12 gauge. Then the pins will fit into the binding post holes.

 

[jtatknox]

I will try these pins!

Project update: transistors arrived today. It was not easy to get in there, but I got the transistor replaced on the first try and now the amp is working perfectly!

I biased both sides and all is well.

I am waiting for new filter capacitors from DigiKey. Recommend checking bias again after replacing filter caps?

Another Phoenix rises!!!

 

[laatsch55]

Always check bias when ya got er opened up...

 

[Skratch]

If you can't get it fixed on this forum its not broken

 

[jtatknox]

I prefer the straight barrel type. I bought a bunch of these on Amazon several years back and they can take up to 10 gauge. View attachment 59146

Those look nice! How long are they? Mine measure about 18mm. The banana plugs I always use bottom out too early (photo attached)...

 

[jtatknox]

Always check bias when ya got er opened up...

Good advice. I will check bias in both units when filter caps get here.

On an unrelated note, I spent the afternoon replacing filter caps and installing Don's fantastic speaker protection relay in the Phase Linear 400 I have had sitting for 6 months. Very happy with how it all turned out except I can barely turn it up enough to make the VU meters dance before I get into noise complaint territory!

Can anybody recommend touch-up enamel for the VU meter surrounds?

 

[George S.]

Good advice. I will check bias in both units when filter caps get here.

On an unrelated note, I spent the afternoon replacing filter caps and installing Don's fantastic speaker protection relay in the Phase Linear 400 I have had sitting for 6 months. Very happy with how it all turned out except I can barely turn it up enough to make the VU meters dance before I get into noise complaint territory!

Can anybody recommend touch-up enamel for the VU meter surrounds?

I and others just use a black sharpie magic marker, others bead blast them clean and spray paint.

 

[Gepetto]

I and others just use a black sharpie magic marker, others bead blast them clean and spray paint.

Or take paint stripper to them to get them down to base metal and then spray paint with color of your choice.

Perry likes lime green...

 

[laatsch55]

Good advice. I will check bias in both units when filter caps get here.

On an unrelated note, I spent the afternoon replacing filter caps and installing Don's fantastic speaker protection relay in the Phase Linear 400 I have had sitting for 6 months. Very happy with how it all turned out except I can barely turn it up enough to make the VU meters dance before I get into noise complaint territory!

Can anybody recommend touch-up enamel for the VU meter surrounds?

Jani, ( my wife) uses a textured black...kinda cool stuff, just rattle can black man..