Power transistor help

[Gepetto]

And the hog hair cleaning brushes are like this...

Amazon.com: MG Chemicals - 857 Technical Cleaning Brush with 5" Chiseled Style Wood Handle, Hog Hair Bristles, 3/4" Length x 5/16" Width : Health & Household

 

[laatsch55]

Thanks Joe!!

 

[gary33030]

I'm now working On a Carver C-500 amp. Its close to a Phase Linear 400. How do you measure the Bias Voltage?
Thanks in advance!!

 

[gary33030]

And adjust?

 

[gene french]

And adjust?

goto hifiengine.com
create an account..
do a search for carver c500...
the service and users manual are there...i just looked...

 

[WOPL Sniffer]

Here is the link to the service manual.... when all else fails, find the manual

https://www.hifiengine.com/manual_library/carver/c-500.shtml

 

[gene french]

Here is the link to the service manual.... when all else fails, find the manual

https://www.hifiengine.com/manual_library/carver/c-500.shtml

rtfm???
lolololol

 

[gary33030]

To both of you, Thanks very much!

 

[WOPL Sniffer]

Here ya go

 

[J!m]

Wow sniff! Being generous today!

 

[WOPL Sniffer]

Wow sniff! Being generous today!

Too hot to be outside.

 

[J!m]

It’s NOT a dry heat…

 

[gene french]

well...any progress???

 

[wattsabundant]

Here is the link to the service manual.... when all else fails, find the manual

https://www.hifiengine.com/manual_library/carver/c-500.shtml

No, when all else fails, read the manual.

 

[wattsabundant]

You have to be careful with test gear and ground connections on the C-500. The right channel is inverted and the white binding post is at ground potential.

 

[WOPL Sniffer]

You have to be careful with test gear and ground connections on the C-500. The right channel is inverted and the white binding post is at ground potential.

Yer right Don. Carver amps (The Magnetic Field Power Amp variety) that have the Triac's in the circuit will also ruin your day if you are not careful when using the ol O'scope. Not following the "Danger Warnings" in the Service Manuals, you'll blow some retinas out..... I think it was from using a grounded Scope Probe on the triac. I stayed well away from them.

 

[gary33030]

Good morning, everyone.

Again, I need someone's help. I've started my second amp. Another Phase linear 400. I'm on step #18 from Joes backplate bring up recommendation. There he has us check for no voltage at the output terminals. Right channel is reading .000, but my left channel reads .139. I don't know where to go from here. I'm sure one board is good. I've compared and measured both boards side by side and cannot find a difference between them. Can someone steer me in the right direction? What should I be looking at or for? Note: All that's installed is the bottom row of transistors.

 

[wattsabundant]

What's the AC Input voltage?

 

[gary33030]

120 Volts

 

[wattsabundant]

Yer right Don. Carver amps (The Magnetic Field Power Amp variety) that have the Triac's in the circuit will also ruin your day if you are not careful when using the ol O'scope. Not following the "Danger Warnings" in the Service Manuals, you'll blow some retinas out..... I think it was from using a grounded Scope Probe on the triac. I stayed well away from them.

Yea, I learned the hard way with scopes that are grounded through the AC input plug. We used a 2.2 ohm 1/4W resistor on the ground lead. 2.2 ohm as we had a pile of them. That doesn't fix the problem. It just does less damage to the probe.