I was checking the original handwriting versus the schematic and I am wondering why the tonestack is different
The handwriting has 250ka treble while schematic has 250kb. The Handwriting has .01 mid cap while the schematic has .05
I probably just copied and paste from a previous schematic.
Bombacaototal wrote:Regarding the Phase Inverter load I notice this amp uses 100k with 110k. What is the difference between this and the #102, #124 ODS which use 110k with 120k (the rest of the PI is identical)?
I was checking the original handwriting versus the schematic and I am wondering why the tonestack is different
The handwriting has 250ka treble while schematic has 250kb. The Handwriting has .01 mid cap while the schematic has .05
I probably just copied and paste from a previous schematic.
Bombacaototal wrote:Regarding the Phase Inverter load I notice this amp uses 100k with 110k. What is the difference between this and the #102, #124 ODS which use 110k with 120k (the rest of the PI is identical)?
Here's a layout. The 2 pots unique to #60 have been moved to the front of the amp. The values are incorrect, perhaps someone with Viso skills could edit them.
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Eric
1949 Zenith, Zenith Toggle Recoil, Zenith 55 & 440
Do you have this in jpeg? Unfortunately I cannot open this extension
I am actually having The feeling that the reverb signal of this circuit leaves from the pre amp, before the high pass filter like Dumble's usual formal, and not from the relay
Clean gain (Volume) > tone controls > the other gain stage > clean master Ratio (located on back) > two OD stages’ Gain and Level on front > OD Ratio (on back, tones are mostly bypassed in OD mode) > Reverb > Clean/Wet summing stage before the phase inverter, which is different from Fender circuits.
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I built out this amp last year in a Super Reverb sized chassis, did a cap doghouse underneath for all the capacitors. Built following Aaron's schematic to the letter - In stock form I didn't much care for the clean tone, but the OD tone was cool. Something makes me think this amp is still not 100% documented out - maybe needs some small value changes. Other than that, the reverb is heavenly! Here is a layout i did of mine in a SR chassis:
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"It's like what Lenin said... you look for the person who will benefit, and, uh, uh..."
I opted out of the FET circuit in mine, and made a few small changes.
To be honest, i didn't even know someone drew out the layout for ODSR#60 lol! I see now that there are a few changes in the reverb circuit and swapping an audio taper pot for the Treble control. Will give those a try.
"It's like what Lenin said... you look for the person who will benefit, and, uh, uh..."
beasleybodyshop wrote: ↑Tue Mar 07, 2017 3:01 pm
I opted out of the FET circuit in mine, and made a few small changes.
To be honest, i didn't even know someone drew out the layout for ODSR#60 lol! I see now that there are a few changes in the reverb circuit and swapping an audio taper pot for the Treble control. Will give those a try.
Very nice your project and thanks for sharing. I just got Aaron schematic and matched against the handwriting drawing from the tech who had access to the amp. I need to look into more detail into the gut shots to make sure what he wrote was correct.
The treble pot is a 2-35 vintage fender style AUD. It has a different response from a normal Audio taper (maybe that is why the 250kb was used as a close substitute) but one thing to note and bear in mind this amp uses the same pot on mid and treble
