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bnwitt
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« on: August 19, 2007, 08:34:48 pm » |
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NOTE: this thread goes with the other archived thread on Hoffman Boards for Princeton
Reverbs
For those of you wishing to use the Mallory caps, here is a mask that moves the three turrets so the .1uf Mallory caps will fit. I couldn't post this on the orginal thread as it is an archive now.
Barry
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« Last Edit: February 08, 2010, 10:17:41 am by bnwitt »
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Guides on your quest for tone.
Oh yeah, and I'm usually just kidding so don't take me too seriously.
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bnwitt
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« Reply #1 on: August 19, 2007, 08:35:56 pm » |
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Here is the loaded board
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« Last Edit: February 08, 2010, 10:17:54 am by bnwitt »
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Guides on your quest for tone.
Oh yeah, and I'm usually just kidding so don't take me too seriously.
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bnwitt
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« Reply #2 on: August 19, 2007, 08:40:56 pm » |
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Here is the wiring layout.
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« Last Edit: February 08, 2010, 10:18:06 am by bnwitt »
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Guides on your quest for tone.
Oh yeah, and I'm usually just kidding so don't take me too seriously.
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bnwitt
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« Reply #3 on: August 19, 2007, 08:51:15 pm » |
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By the way, if you're going to use the 20/20/20/40 uf multicap can, make sure you put the 40uf terminal on the very first turret of the power rail where the OT red wire and the wire from the standby switch are connected.
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Guides on your quest for tone.
Oh yeah, and I'm usually just kidding so don't take me too seriously.
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mick
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« Reply #4 on: December 02, 2007, 07:02:36 pm » |
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Barry,
Maybe a dumb question, but why do you show the bias feed comming fromt the rectifier tube (pin 8). Is there an advantage to using a dc feed for your bias circuit??
Mick
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bnwitt
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« Reply #5 on: December 03, 2007, 12:17:06 pm » |
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Mick,
I answered your email too and the answer is that is a mistake on the layout. Thanks for catching it. I will post the new wiring layout.
Barry
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Guides on your quest for tone.
Oh yeah, and I'm usually just kidding so don't take me too seriously.
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bnwitt
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« Reply #6 on: February 08, 2010, 10:04:13 am » |
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MResistor brought to my attention that none of the files in the posts above would download. For some reason the links went to an error page. I have reloaded each file in each post. They should download again. Also, here is the schematic with notes.
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« Last Edit: February 08, 2010, 10:18:49 am by bnwitt »
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Guides on your quest for tone.
Oh yeah, and I'm usually just kidding so don't take me too seriously.
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EL34
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« Reply #7 on: September 03, 2012, 08:26:38 am » |
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I found a wiring mistage on the PDF layout diagram
See the area in the image below with the red box
The wire should go from the top of the .1 cap to the top of the 56K resistor
The 1.5K resistor should be a 1K resistor if you are using the original value from the AA1164 princeton reverb
here's a image file showing the changes
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EL34
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« Reply #9 on: September 03, 2012, 09:44:27 am » |
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Hmm,
This is cathode section of V4b shown in my gif file below
barry's schematic and my CAD drawing layout
I have double check it several times and it still looks right
What am I missing?
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« Last Edit: September 03, 2012, 09:46:29 am by EL34 »
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sluckey
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« Reply #10 on: September 03, 2012, 10:05:32 am » |
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That ain't the original schematic. That's Barry's redrawn schematic and it is in error. Look at the schematic from the library that I posted above. Or look at the clip of the original schematic below. The cap connects directly to the cathode of that tube, not the junction of those resistors.
Barry's layout agrees with the original schematic except that he shows a 1.5K resistor on the layout for Mallory caps. His original layouts correctly show a 1K.
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EL34
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« Reply #11 on: September 03, 2012, 10:09:13 am » |
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yeah, I had Barry's schematic in front of me
I'll go sort it out again cause I am drawing up a layout drawing for a Hoffman princeton reverb
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sluckey
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« Reply #12 on: September 03, 2012, 10:16:12 am » |
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Take a look at Barry's layout in reply #2 above. It's correct (I think) and may save you some time doing your style layout drawing.
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EL34
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« Reply #13 on: September 03, 2012, 10:19:02 am » |
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I already have my layout drawn up
I just had to change that section
Here it is
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