PL 300 S2

The other channel. Bias was initially appx .47 VDC on each channel before I adjusted it down to .40 VDC.
 

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The manual says a maximum of + or - 10 mV DC offset voltage. It's within spec.
Going to install some Budwig feet on the bottom plate and she's done for now.
Future mods will be replacing the ceramics with silver mica and film.
 

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George S. said:
The manual says a maximum of + or - 10 mV DC offset voltage. It's within spec.
Going to install some Budwig feet on the bottom plate and she's done for now.
Future mods will be replacing the ceramics with silver mica and film.
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you have noce testing equipment mr. george!!!
thanks for sharing...
 
Klaus Schulz.....The Rhodes Elegy
Yup, excellent little amplifier. Driving the JBL Millenniums. This will work well in the active system if the gain structure is close enough to the WOPLs.
The A30 Professional version of this is now listed on eBay. Poor condition and ridiculously way over priced.
 

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George S. said:
Thanks Gene. I find the test equipment fascinating and very interesting. Wish I could afford more of it, but piece by piece I'm getting there.
Like you, I enjoy fixing the old stuff and learning how it works.
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we have the best of both
George S. said:
Klaus Schulz.....The Rhodes Elegy
Yup, excellent little amplifier. Driving the JBL Millenniums. This will work well in the active system if the gain structure is close enough to the WOPLs.
The A30 Professional version of this is now listed on eBay. Poor condition and ridiculously way over priced.
Click to expand...
recognize the vlc logo...used that many many years ...
 
George S. said:
Klaus Schulz.....The Rhodes Elegy
Yup, excellent little amplifier. Driving the JBL Millenniums. This will work well in the active system if the gain structure is close enough to the WOPLs.
The A30 Professional version of this is now listed on eBay. Poor condition and ridiculously way over priced.
Click to expand...

Should work In the active system like a glove...
 
George S. said:
Klaus Schulz.....The Rhodes Elegy
Yup, excellent little amplifier. Driving the JBL Millenniums. This will work well in the active system if the gain structure is close enough to the WOPLs.
The A30 Professional version of this is now listed on eBay. Poor condition and ridiculously way over priced.
Click to expand...
Yeah but it is 600W George :-)
 
According to my calculations it'll do 600 watts per channel into 1.5 ohms. Service manual says it should output 31 Vrms before distortion rises. So using the Watts Law AC equation, 30x30 divided by 1.5= 600 watts. There's probably a mountain of factors that I don't understand that wouldn't allow this. :)
On a serious note, been running the amp continuously all day playing Klaus Schulze FLAC files because his music has so much dynamic range. It just keeps getting better and better as those new caps settle or burn in. Just another thing I don't understand and probably never will as I can't see it or touch it. Has to do with aluminum oxide forming on the caps internal surfaces from the little I've read. I believe it's a real effect, and not imagination.
 
George S. said:
According to my calculations it'll do 600 watts per channel into 1.5 ohms. Service manual says it should output 31 Vrms before distortion rises. So using the Watts Law AC equation, 30x30 divided by 1.5= 600 watts. There's probably a mountain of factors that I don't understand that wouldn't allow this. :)
On a serious note, been running the amp continuously all day playing Klaus Schulze FLAC files because his music has so much dynamic range. It just keeps getting better and better as those new caps settle or burn in. Just another thing I don't understand and probably never will as I can't see it or touch it. Has to do with aluminum oxide forming on the caps internal surfaces from the little I've read. I believe it's a real effect, and not imagination.
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If you put your ear really close to the capacitors, you can hear the oxide forming :-)
 
I also got a PL 300 for $175 is working fine, sound really good, very much like a modern amp. I am going to send the it to my tech for a restoration, any mods besides better parts ?
 
Really no upgrades that I'm aware of other than doing a full recap, inspection of all boards and joints, get all the flux off the boards.
Mine has sat unused since I gave it a little burn in time.
I do want to add a IEC socket to it.
Eventually it'll do tweeter duty on a 4-way amp/active crossover system.
 
If it's working, just get it recapped. This was built during the era when Pioneer owned PL. Better parts were used( this can be argued :)). Uses the same output transistors that Pioneers flagship receivers used at this time period.
 
George S. said:
If it's working, just get it recapped. This was built during the era when Pioneer owned PL. Better parts were used( this can be argued :)). Uses the same output transistors that Pioneers flagship receivers used at this time period.
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How do you like the amp so far ?
Did you do any comparison with his siblings ?
 
SirPaulGerman said:
How do you like the amp so far ?
Did you do any comparison with his siblings ?
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I haven't used mine at all since the initial burn in after the recap. I think it would be a excellent amp for a smaller room with book shelf speakers.
A large room with floor standers? Probably not so good.
Tweeter duty in a active crossover system? That's my goal for it.
 
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