DELUXE REVERB NORMAL:LEAD CHANNEL MODS

[sluckey]

Thanks. I assume you mean the .0022 cap off of the cathode follower? I simply copied the tone stack from a Super Lead schematic.

I don't think so. YOU added that .0022 cap.

[ViperDoc]

Thanks. I assume you mean the .0022 cap off of the cathode follower? I simply copied the tone stack from a Super Lead schematic.

I don't think so. YOU added that .0022 cap.

GUILTY AS CHARGED. Indeed, it looks like I duplicated the .0022 cap before the volume pot when cutting and pasting my schematic in KiCAD. Thanks for catching it, gentlemen! I'll correct that.

[dcribbs1412]

Here are a couple of examples of the Normal channel modded into a somewhat Marshall topology

Interesting changes to the DR circuit. What are the diodes on V2? Bias the stage?

[pdf64]

Here are a couple of examples of the Normal channel modded into a somewhat Marshall topology

Interesting changes to the DR circuit. What are the diodes on V2? Bias the stage?

It’s a DCCF! The diode prevents arcing at power ip. http://www.valvewizard.co.uk/dccf.html

[dcribbs1412]

Here are a couple of examples of the Normal channel modded into a somewhat Marshall topology

Interesting changes to the DR circuit. What are the diodes on V2? Bias the stage?

It’s a DCCF! The diode prevents arcing at power ip. http://www.valvewizard.co.uk/dccf.html

Thanks pdf64
interesting idea for safe guarding preamp tubes

[ViperDoc]

Fixed--errant .0022 cap, incorrect tone slope resistor value. Might need new glasses.

AB763 LEAD CH 3.0.pdf

[sluckey]

You don't need the .022 cap on the treble wiper.

There still must be a cap on the PI input. In the DR this is a .001µF.

[pdf64]

I think 5F6A / Marshall treble pots are usually linear. Typical 10 or 15% audio taper types may not have a friendly range of control if used there, with most the change occurring between halfway and max.

[Sasquach]

Fixed--errant .0022 cap, incorrect tone slope resistor value. Might need new glasses.

AB763 LEAD CH 3.0.pdf

Did you ever add this to your DR? Results?

I may try this with the FET just to see how well it works. Looks like I need to rewire to get input--> gain-->volume-->gain--> CF -->TS -->PI

Afterwards I may do Sluckey's tremonater mod to free up a 12AX7 to do the CF mod with a tube.

I assume the FET is inferior to the tube CF?

[ViperDoc]

Fixed--errant .0022 cap, incorrect tone slope resistor value. Might need new glasses.

AB763 LEAD CH 3.0.pdf

Did you ever add this to your DR? Results?

I may try this with the FET just to see how well it works. Looks like I need to rewire to get input--> gain-->volume-->gain--> CF -->TS -->PI

Afterwards I may do Sluckey's tremonater mod to free up a 12AX7 to do the CF mod with a tube.

I assume the FET is inferior to the tube CF?

I’ll let you know when I build it. I’ve got to crack the code on my Jubilee first.

[Sasquach]

I'll probably give it a shot too.

[Sasquach]

First step in the mod is to do the Trem-O-Nator Mod to the DR to free up 1/2 of a 12AX7 to use as the Cathode Follower.
Of course I need to change to the Vactrol VTL5C1

I've edited the Weber schematic for the DR. See any problems?
I'll add the layout mod when I finish it.

[Sasquach]

Adding the Layout with the Trem-O-Nator mod for the DR.
Ignore the edits on the right side. I started the mod to add the CF

[Sasquach]

I did the Trem-O-Nator mod. Works great. Thanks Sluckey.
The mod freed up 1/2 an 12AX7 so I could do the CF mod.

I also finished the CF mod that Viperdoc drew out. I used the attached schematic. Some of the plate resistors are 200k instead of 100k.

How can I test it to make sure it's working? I don't have the best ear to test it but I have tons of test equipment. Ideas?

I also am getting some buzzing noise when I hit certain notes so I'm rechecking tube sockets tightness, cleaning pins, solder joints.

DR-CF.jpg

[ViperDoc]

I did the Trem-O-Nator mod. Works great. Thanks Sluckey.
The mod freed up 1/2 an 12AX7 so I could do the CF mod.

I also finished the CF mod that Viperdoc drew out. I used the attached schematic. Some of the plate resistors are 200k instead of 100k.

How can I test it to make sure it's working? I don't have the best ear to test it but I have tons of test equipment. Ideas?

I also am getting some buzzing noise when I hit certain notes so I'm rechecking tube sockets tightness, cleaning pins, solder joints.


DR-CF.jpg

I'm interested how you like your CF mod. To be clear, anything drawn by me is more of a report for my own learning purposes, not anything to be trusted. I'm serious. I am only a student here. Make sure you get advice from more experienced builders. That said, plate resistor values are only meaningful with relation to the B+ voltage they are dropping to reach your operating plate voltage for the gain stage in question. Make sure you safely test your circuit's voltages with a bulb limiter first, lots to learn there. As always!