2025 Monkeymatic Palisade 30w (Liverpool, non traditional)

[Phil_S]

Excellent! Looks great. I don't see any provision to vent the heat. Do you see this as unnecessary?

[Guy77]

Looks absolutely beautiful !
I love having an LND 150 input stage in front of my amps!

Your method is a very cool way to build it. ( I usually buy it already assembled on a Cliff jack )

Is there way you can roll off the gain on your LND 150 with a Trimmer pot?

Thanks for posting!

Cheers
Guy

[xtian]

Looks absolutely beautiful !
I love having an LND 150 input stage in front of my amps!

Your method is a very cool way to build it. ( I usually buy it already assembled on a Cliff jack )

Is there way you can roll off the gain on your LND 150 with a Trimmer pot?

Thanks for posting!

Cheers
Guy

No, I didn't install a trimmer. Where do you get the Cliff/FET input jack thing?

[Guy77]

Looks absolutely beautiful !
I love having an LND 150 input stage in front of my amps!

Your method is a very cool way to build it. ( I usually buy it already assembled on a Cliff jack )

Is there way you can roll off the gain on your LND 150 with a Trimmer pot?

Thanks for posting!

Cheers
Guy

No, I didn't install a trimmer. Where do you get the Cliff/FET input jack thing?

This is LND 150 gain stage on a Cliff jack that I like to use. It can add a lot of gain by adjusting the trimmer. I order it with a 25k trimmer and its more than enough.

I am the one that placed the review.

https://grangeramp.com/product/superfet-jack-3/

Cheers
Guy

[maxkracht]

Amp and cabinet look great! nicely done!

i'm too cheap to spend $50 on a premade board, but seemed like a fun idea. Here's an untested version with some added features. Mostly SMD, but allows for a through hole lnd150. Will report back if it works/what dumb layout mistakes I made. https://oshpark.com/shared_projects/GvzLdhnL

Edit: further info https://ampgarage.com/forum/viewtopic.p ... 84#p476284

[TUBEDUDE]

Very nice clean build, as usual with your builds! Yeah, not every great sounding build is also bedroom friendly.
How's the baseline hum? I've never worked on a Liverpool, does the original have the O.T. and power xfmr on top of each other? It looks like Ken had real estate to spare. Just curious.

[xtian]

Very nice clean build, as usual with your builds! Yeah, not every great sounding build is also bedroom friendly.
How's the baseline hum? I've never worked on a Liverpool, does the original have the O.T. and power xfmr on top of each other? It looks like Ken had real estate to spare. Just curious.

It's very quiet, even with the master volume wide open, but only rates an A- in my book. There is a little radiated hum from PT to OT, which I was able to mitigate about 50% by adding an aluminum shield between the two. What's curious is that I can just float that shield in place by hand, without it touching the chassis (meaning the shield is not electrically connected to the chassis) for it to work. Then, screwing the shield to the chassis makes no change. Just its presence in space is enough to deflect the field away from the OT. All this was figured out using the headphone trick.

[TUBEDUDE]

Very nice clean build, as usual with your builds! Yeah, not every great sounding build is also bedroom friendly.
How's the baseline hum? I've never worked on a Liverpool, does the original have the O.T. and power xfmr on top of each other? It looks like Ken had real estate to spare. Just curious.

It's very quiet, even with the master volume wide open, but only rates an A- in my book. There is a little radiated hum from PT to OT, which I was able to mitigate about 50% by adding an aluminum shield between the two. What's curious is that I can just float that shield in place by hand, without it touching the chassis (meaning the shield is not electrically connected to the chassis) for it to work. Then, screwing the shield to the chassis makes no change. Just its presence in space is enough to deflect the field away from the OT. All this was figured out using the headphone trick.

I'm a big fan of the headphone technique. I start every build using it to place the iron. The circuitry develops from there.
An A- is a good score. That is odd the way the field is diverted without connection, especially with aluminum. Good work!

[martin manning]

What's curious is that I can just float that shield in place by hand, without it touching the chassis (meaning the shield is not electrically connected to the chassis) for it to work. Then, screwing the shield to the chassis makes no change. Just its presence in space is enough to deflect the field away from the OT.

I'm going with the magnetic field from the PT is inducing eddy currents in the aluminum sheet, dissipating its energy before it can get to the OT.

[xtian]

I noticed the same deal when positioning a choke between PT and OT. Bends the field.

[didit]

Hello --

Try mu-metal.

..

[LOUDthud]

Question: How does the LND150 front end sound with Overdrive pedals ? I've always been under the impression that a 12AX7's grid current played a significant role.

[xtian]

I've been playing this amp at home with a variety of overdrive, distortion, and fuzz pedals. Sounds great. But even with pedals engaged, I'm not pushing a signal that's any larger than usual into the amp. Nowhere close to overdriving the LND150.

12A?7s are linear when they're not being driven into distortion. You can't easily drive the first gain stage into distortion with an electric guitar. The LND150 sounds exactly the same to me as using a valve as a first gain stage.

[LOUDthud]

12A?7s are linear when they're not being driven into distortion. You can't easily drive the first gain stage into distortion with an electric guitar. The LND150 sounds exactly the same to me as using a valve as a first gain stage.

That's true, but the point of my question is how the LND150 behaves with an overdrive pedal. An overdrive pedal can easily drive a 12AX7 beyond it's linear range. Look at the X-Y oscilloscope pics in post #3 of this thread:

https://www.ssguitar.com/index.php?topic=3732.0

You probably have to join the forum to see the pics.

[TUBEDUDE]

Hello --

Try mu-metal.

..

It works well, but is expensive, and if cut or bent it requires annealing to keep it's effectiveness. I would think steel would work better than aluminum. At any rate he solved it, and cheaply.