Backstage Service

Backstage Service Backstage Service, owned and operated by Kent Fossgreen, has been providing quick reliable service for musicians for over twenty years.

We repair new and vintage guitar amps, keyboards, recording gear, and sound reinforcement equipment.

Who's a good boy? This amp and our special guest model! This Fender Musicmaster Bass chassis came here in a box, partial...
03/26/2026

Who's a good boy? This amp and our special guest model! This Fender Musicmaster Bass chassis came here in a box, partially disassembled. We put it back together with new filter capacitors and a few minor mods to make it a great sounding guitar amp. The owner did the cabinet and the spiffy new grille cloth. It'll make you sit up and take notice!

02/11/2026

What??!!?? Another brown Princeton? Yep, this one's got an Altec speaker. The guitar is a 60's Gibson 330, P-90's swapped out long ago for 60's humbuckers. Replaced the gone-concave ABR-1 bridge, now it plays like a dream! (And before you ask, no, neither the guitar or the amp is for sale!) Got an amp, keyboard, guitar or bass that's not behaving? Come on down!

02/05/2026

The Tale Of Two Princetons
Up first, this beautiful brown Princeton we rebuilt for Star Guitars in Santa Rosa. Ever-tasteful Connor Gill displays its tonal majesty. Next, Connor again, this time playing through a 1971 Princeton that we modified for more clean headroom while completely rebuilding it. This amp could be yours. Also, an Explorer with a Bigsby! Seriously, how cool is that?

01/28/2026

The always-tasteful Connor Gill playing through the rehabilitated Randall Smith modified silverface Fender Deluxe Reverb. If your amp sounds tired and listless, it's time to bring it in for a spa treatment!

A real piece of North Bay history here. This silverface Fender Deluxe Reverb was modified by Randall Smith back in the p...
01/28/2026

A real piece of North Bay history here. This silverface Fender Deluxe Reverb was modified by Randall Smith back in the pre-Boogie days. From all appearances, Randall was the last tech to open this thing up, so it was deferred maintenance time. New tubes, new filter capacitors and various other bits and bobs and it's ready for another 50 years.

01/22/2026

Here's the vintage Silvertone, bridge reattached, stripped tuner screw holes filled and redrilled, controls cleaned, dead tone control toggle switch replaced, Connor Gill playing it through the Fender Musicmaster Bass amp that we modified to be a sweet little guitar amp. Got an amp or guitar that needs some love? Turning most repairs around overnight or within a day or two right now--come on down!

OG Silvertone, came in filthy and in need of a setup and electronic rehab. Completed the cleaning, when I brought the la...
01/22/2026

OG Silvertone, came in filthy and in need of a setup and electronic rehab. Completed the cleaning, when I brought the last string close to tension, the bridge informed me that the rear screw that secures it to the guitar was stripped by popping off. Happy ending in the next post!

Ever seen a guitar like this? Probably not, this is a first for me, the XOX Audio Tools The Handle guitar, all carbon fi...
01/10/2026

Ever seen a guitar like this? Probably not, this is a first for me, the XOX Audio Tools The Handle guitar, all carbon fiber. This one came in with serious wiring issues, bad solder joints, burned insulation and a big pile of WRONG. Got everything cleaned up and working correctly, got it all set up and intonated. A truly impressive instrument/work of art.

I'll be closed 12/30, 12/31 and 1/1/2026. Back on Friday 1/2/2026. If you want to see me in my musician role, come to Ho...
12/30/2025

I'll be closed 12/30, 12/31 and 1/1/2026. Back on Friday 1/2/2026. If you want to see me in my musician role, come to Hopmonk Sebastopol on 1/1, my band, Bohemian Highway will be playing from 3-6, great songwriter/performer Michael McNevin opens the show.

One for the rockers: 2014 Marshall DSL100H with new output tubes, a couple of very minor nicks in the Tolex and a bit of...
12/22/2025

One for the rockers: 2014 Marshall DSL100H with new output tubes, a couple of very minor nicks in the Tolex and a bit of discoloration on the faceplate, but functionally perfect. Test your neighbors' patience this holiday season! $500

As we all know, George didn't need no wah-wah, but maybe you do. Here's a couple of nice ones! An original purple Budda ...
12/21/2025

As we all know, George didn't need no wah-wah, but maybe you do. Here's a couple of nice ones! An original purple Budda BudWah, missing its logo plate but otherwise in good shape. Next up a Crybaby GCB95 with the Joe Gagan deluxe mod kit installed, giving you the option to tune the wah to your heart's content. $150 for each.

Address

7878 Old Redwood Highway
Cotati, CA
94931

Opening Hours

Monday 11am - 5pm
Tuesday 11am - 5pm
Wednesday 11am - 5pm
Thursday 11am - 5pm
Friday 11am - 5pm

Telephone

+17077958391

Website

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