Yes the 5uF polypropylene will be a big upgrade from the electrolytics.
Cory's Phase Linear 2000 Ser II Restoration
- Thread starter laatsch55
- Start date
Yes the 5uF polypropylene will be a big upgrade from the electrolytics.
Does it howl with the Tone switch out and the Equalizer switch out? Try both positions to see if we can narrow this down.
The OPA2134 has at least 8 times the gain bandwidth product of the original 4136 (8MHz vs 1 MHz for the 4136). I notice no local bypassing on the schematic for Z3 which is the one you replaced. It cannot hurt. The data sheet for the 2134 says this
Power supply pins shouldbe bypassed with 10nF ceramic capacitors or larger to
minimize power supply noise.
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" When the Brown Dog howls"
" Steer clear of the Jowls"
"And by-pass such"
"With Capacitance thus"
"That allows it to go away..."
Quietly......
" Steer clear of the Jowls"
"And by-pass such"
"With Capacitance thus"
"That allows it to go away..."
Quietly......
- Joined
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- 75,466
- Location
- Gillette, Wyo.
- Tagline
- Halfbiass...Electron Herder and Backass Woof
Only 2 C & C's and a Fuzzy Baileys....
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Horrible day, but a very good night!
Shit - kind of sounds like my limericks - maybe a little better than mine but not by much.
A little heavy on the Crown I take it. Ya know - the Fuzzy Baileys is a chick drink.
I have been partial to Hendricks dirty martini's lately, 2 olives. If you have not tried that Gin, it is great for martinis. I am pretty safe that is not a chick drink Dennis.
I am pretty sure that the power and ground pins on the RC4136 were 4 and 11 from my recollection back to the early 80's when I first used that IC for motor control. I think bypassing from 7 to 11 may make is 'scream' instead of howl.
Does it howl if you use the 2nd set of outputs or are they OK?
Do you have a PL power amp that is being fed by this preamp?
I have used it on a Luxman M4000 and now a Marantz 1060 (on the main in ,jumpers removed).both sets of inputs howl. I meant the pins 7,11 to ground sorry. I'm looking at the PL 2000II schematic and the + inputs go to ground pins 2,5,9,13. Pin 11 is B+ and 7 is B-. I'm not sure how to ground them now .
You are correct, 11 is V+ and 7 is V-
I haven't tried Hendricks but I'll have to give it a try sometime. Yeah Joe - I'd agree that this one's not a chick drink.
Not chassis ground, board ground
Looking at the board layout drawing and the accompanying schematic in the service manual there are two very convenient and co located components that are tied to board ground. R35 and R36 have one leg tied to ground and they are on either side of Z3 so this could be a very short jumper.