80's KMD Donor For SSS Build...Requesting input please

[Blindog]

So I've had this monster laying around for a while, trying to figure what to build with it. With all that big 'ole iron and the 4x6550 output section, I've landed on a SSS build. As you can see in the pic, I gutted the preamp boards and kept the output section plus power supply board intact. I had an eyelet board made with tube sockets attached to replicate how the original tubes were mounted on the pc board.

Question is, I've got 5 preamp tube slots, so what do you all think about using the one tube reverb circuit like what was used in the D'lite? Or not use reverb at all and add a loop....I have a D-lator. If I go that route, I'll obviously have a spare tube to play with...

Another question...what would be the easiest way to go about getting the 150V for the driver tube? I've attached the schematic for the KMD.

Thanks in advance!!

Mark

[tictac]

Looks like you can come off one leg of your B+ using one diode and a 3K or so dropping resistor to make a 1/2 wave negative supply. Realize your negative supply will draw close to 1 watt at idle so make sure you size that dropping resistor accordingly. I used two 6.8K/5W in parallel to make a 3.4K/10W resistor.....

TT

[Blindog]

Looks like you can come off one leg of your B+ using one diode and a 3K or so dropping resistor to make a 1/2 wave negative supply. Realize your negative supply will draw close to 1 watt at idle so make sure you size that dropping resistor accordingly. I used two 6.8K/5W in parallel to make a 3.4K/10W resistor.....

TT

Okay, I see what you mean.

Thanks TT, one part of my puzzle solved!

Mark

[tictac]

Seems like a built in loop would be the easiest way to got. There's lots of good info on all kinds of on board loops, series/parallel etc...

I like parallel loops myself and looking at the SSS reverb circuit looks like it

was a parallel circuit as well...

TT

[Blindog]

Seems like a built in loop would be the easiest way to got. There's lots of good info on all kinds of on board loops, series/parallel etc...

I like parallel loops myself and looking at the SSS reverb circuit looks like it

was a parallel circuit as well...

TT

Yes, I think that makes better sense, and a better use for that extra tube!

Now I gotta get my BM HRM done and get crankin' on this!

Thanks again TT

Mark

[CHIP]

I've been checking out the SSS#002 layout that was drawn by Aaron (I think), anyway there seems to be a conflict between the original hand drawn schem. and the layout on V1B . The .01 uF and .001uF caps junction with the 100k V1B plate resistor is different on both references. I think the hand drawn original schem. is correct. I think the plate resistor junction is where the 2 caps join, not just at the .01uF cap. Check it out.

[Blindog]

I've been checking out the SSS#002 layout that was drawn by Aaron (I think), anyway there seems to be a conflict between the original hand drawn schem. and the layout on V1B . The .01 uF and .001uF caps junction with the 100k V1B plate resistor is different on both references. I think the hand drawn original schem. is correct. I think the plate resistor junction is where the 2 caps join, not just at the .01uF cap. Check it out.

Great, thanks for that info..I was just gonna ask about schematics next! Layouts are cool, but I really like to build off of a schematic and reference the layout as I go.

After searching, I think the attached may be the latest pdf version of the hand drawn?


Mark

[CHIP]

This one. https://tubeamparchive.com/download/file.php?id=25770

[Blindog]

Thanks CHIP...my link was broken before, but I added the PDF version...I was curious if this was a good one to use instead of the hand drawn?

Mark

[CHIP]

I'm just getting into this build at this time, so I'm in the same boat as you. I'm comparing those 2 schem. plus comparing pictures and the layout. Sergio has built a working SSS#002, and has posted pictures.
There are errors on the hand drawn schem. I think most were corrected on the PDF.

[Blindog]

I'm just getting into this build at this time, so I'm in the same boat as you. I'm comparing those 2 schem. plus comparing pictures and the layout. Sergio has built a working SSS#002, and has posted pictures.
There are errors on the hand drawn schem. I think most were corrected on the PDF.

Ok, cool! I did some more digging, and for my purposes, I think I like this layout that mhartman made and used on his build. Here's the thread:

https://tubeamparchive.com/viewtopic.ph ... highlight=

Still kind of on the fence about the verb...definitely don't want to do the 3 tube verb due to my real estate/layout but I'm still considering using the 1 tube reverb...I already have a spare reverb tranny...Hmm, verb or built in D-lator...

Mark

[mhartman]

Ok, cool! I did some more digging, and for my purposes, I think I like this layout that mhartman made and used on his build. Here's the thread:

https://tubeamparchive.com/viewtopic.ph ... highlight=

Still kind of on the fence about the verb...definitely don't want to do the 3 tube verb, but I'm still considering using the 1 tube reverb...I already have a spare reverb tranny...Hmm, verb or built in D-lator...

Mark

Let me know if you have any questions on this one. I sold that amp to a musician out in LA who is gigging with it regularly. I'm trying to find the time to build my v1.1 of this one.

[Blindog]

Let me know if you have any questions on this one. I sold that amp to a musician out in LA who is gigging with it regularly. I'm trying to find the time to build my v1.1 of this one.

That's very cool!

I'm sure I'll have some questions, thanks for offering!

Mark

[Blindog]

Here's a layout of the Blue Monkey 88 that I'm building, it uses the one tube verb circuit. I have absolutely zero drawing skills (jealous of y'all that come up with these layouts). Could mahartman's SSS layout be easily edited to incorporate this verb circuit? And if so how could I do that?

Many thanks!

Mark

[Blindog]

Hey all,

I've shelved this project for a while, but I'm ready to get it back out and mess with it again.

I'm using this old KMD to build a SSS02 type amp. My issue is that I only have real estate for 5 preamp tubes, so I want to use the Fender AB763 reverb circuit because it only uses 2 tubes. The problem I'm having is trying to patch in this circuit in place of the circuit as shown in the SSS02 schematic. I've attached both for reference. I've always had a tough time wrapping my brain around this circuit, ie as to where it mixes in and exits back out

Any help would be appreciated!!

Thanks,

Mark

Mark