Forums
New posts
Search forums
What's new
New posts
Latest activity
Members
Registered members
Current visitors
Log in
Register
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Audio and Video Talk
The Vintage Audio Section
Marantz PM-30 Amp
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Help Support AVForums:
This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
Message
<blockquote data-quote="Henry" data-source="post: 480919" data-attributes="member: 14394"><p>Another thing I picked up today when cleaning off the dust from the PC boards today: it seemed that some components where getting quite hot from being driven too hard. So I check the biasing pots, and they were adjusted at their max. I remembered checking the voltages over the emitter resistor before I found the problem, and was reading 20mV over each emitter resistor. According to the manual it should be 7.5V (41.6mA). So it was running more than double it's specified idle current. No wonder things went bad.</p></blockquote><p></p>
[QUOTE="Henry, post: 480919, member: 14394"] Another thing I picked up today when cleaning off the dust from the PC boards today: it seemed that some components where getting quite hot from being driven too hard. So I check the biasing pots, and they were adjusted at their max. I remembered checking the voltages over the emitter resistor before I found the problem, and was reading 20mV over each emitter resistor. According to the manual it should be 7.5V (41.6mA). So it was running more than double it's specified idle current. No wonder things went bad. [/QUOTE]
Insert quotes…
Verification
Post reply
Audio and Video Talk
The Vintage Audio Section
Marantz PM-30 Amp
Top