Fender tone stack in a dumble

[rutledj]

Just curious if anyone has ever built a clone using a stock fender style tone stack and values. Wondering if it is strat friendly.

Thanks,
Rut

[Bob-I]

I took my Super Reverb clone, modded the clean channel to be an ODS and connected it without modding the vibrato channel. Sounded like absolute garbage. I modded the tone stack to Skyliner values and it sounded better but it won't until I bypassed the trem and reverb that it sounded decent.

I put everything back to Super specs. No matter what I did to this amp it didn't sound all that good. It's better as a Super than a Dumble.

[ic-racer]

Just curious if anyone has ever built a clone using a stock fender style tone stack and values. Wondering if it is strat friendly.

Thanks,
Rut

I did one and this is what I found out. A lot of signal strength is lost through the Fender tone stack and this made it a little difficult to get enough gain into the Dumble OD entrance. The volume needed to be on 7-10.

In my case most of this gain loss was through the Fender 10k Mid pot and the 100k Master. Increasing the Mid to 100k and Master to 1M or 500k made the OD section work a lot better without hurting the clean sounds.

So my cleans sound very Fender, but the OD is not typical Dumble sounding. This is fine for me because I wanted it to keep the characteristics of being a Fender amp.

Also, the Fender amp I modded did not have any goofy cathode sharing in the clean stage or tremolo circuits to contend with, and it took to the conversion very well. http://soundclick.com/share?songid=6541275

[bluesfendermanblues]

Ic-raser,

You could ad another realy, to switch
a) a resistor "under" the mid pot, when in OD mode
b) a resistor under the volumepost

To bring you closer to dumbleland in OD mode

[heisthl]

https://tubeamparchive.com/viewtopic.php?t=5541
is the Princeton style Fender stack(with mid-boost option) and does sound great with a strat.

[bluesfendermanblues]

Heistl

My next build will be a "Deluxe" style 2x6V6 combo with your preamp design.

I loved the Tim Betts clips you posted and I want that sound with my strat

[bluesfendermanblues]

dbl post

[rutledj]

ic-racer,

I listened to the Final Mods Super Twin & Strat 1 clip also. Does it have other mods than what you mentioned above?

Rut

[ic-racer]

Ic-raser,

You could ad another realy, to switch
a) a resistor "under" the mid pot, when in OD mode
b) a resistor under the volumepost

To bring you closer to dumbleland in OD mode

Yes! I actually had it wired that way (at least the Mid pot.) The way I got there is I had the PAB relay lifting the mid pot from ground. But this 'mega boost' was too great so I put a resistor across the the switching points. Wound up being exactly as you described and it worked great that way.

I did not leave it that way, because after adding the JAZZ/ROCK switch, it was easier to hook up the 'standard' PAB.

[dogears]

The Bluesmaster is a Fender style stack on the cleans. Although not Blackface. It is one of the nicest clean channels I have heard, and it even works with non HRM.

[rutledj]

Is there a difinitive schematic for the bluesmaster posted anywhere?

Rut

[phalanges]

This is from a post by heisthl:
1M/820/1M are not really the components that make up of what designates an inverter as a long tail pair. The 1m are grid resistors. The 820 is the cathode resistor and the 24K is the tail resistor. In the "Blues master" design the 820 becomes 510 and the 24k becomes 9k1. replace the 390 with a 4k7, the 2k pot with 25k, the 1uf to a .1uf cap, the 4k7 feedback with 100k and add a 47pf across the 2 junctions of Plates to coupling caps to convert.

[rutledj]

So the only difference is in the PI?

[heisthl]

https://tubeamparchive.com/viewtopic.php?t=3344&start=0