Anyone with W4S amps and preamp

I am running the SX-500 monos into Maggie MMG's,

it is a great combination for sound quality, power, and price

My pre-amp is an Adcom GFP-750
definitely coveting the W4S STP pre...think it would be a nice upgrade from the Adcom GFP-750

I am running a ST-500 into a pair of Earl Geddes Abbey 12As, and it sounds great. I use a RHB Sound Dezign modified CJ PV-14L for a preamp, which means I have no choice but to use single ended cables. I am completely happy with the sound of this combo, it is very revealing.

Peb

I am using a Bel Canto Pre 3 that can be has for $950 used while my tube pre is being made.

It is wonderful sounding and would be the perfect upgrade for you.

Boy does this little unit sing!

I am using a Bel Canto Pre3 now and have paired it with Bel Canto a pair of M300s, the S300 and the S500. Also tried the PS Audio Trio A-100 and lastly a Seymour AV ICE Block 5001 with the Pre3. All of these setups were run with balanced connections. My least favorite was the S500 which is a surprise as that is the most expensive one in the bunch.
At this point I am not using class D amps. I picked up a Harman Kardon PA-2200 amp built in the mid to late 90s. After giving the amp a thorough cleaning I installed an IEC socket, rewired the A/C from the socket to the transformer, then rewired the output section with DHlabs cable and installed some Cardas binding posts I had on hand. Put the amp in just to see how it sounded and have had no desire to remove it. Warm, full sound, just a joy to listen to.

Grannyring and Timrhu-- Thanks for the suggestions on the Bel Canto Pre3...
No funds for upgrades yet :(

This is my 1st real system, so I have not had a chance to demo much equipment

Like the OP, I am curious to hear the W4S STP-pre synergy with the W4S amps

The passive section on my Adcom GFP-750 gets the most use.
So, the W4S STP seems like a natural upgrade to the Adcom.

I run the Adcom passive into a Marchand XM-44 -> Maggie MMG's and an Epik Valor sealed 15" sub.

HP/LP set at 60hz/24db slope....works really well in my small room and doesn't bother my neighbors in my duplex

I should get some pics taken and post my system sometime soon...
really enjoy learning and reading on the Agon forum