This amp was recently serviced by renouned Czech amp tech Jan Stehlik (I can provide detailed pdf service report with photos of before and after). All three transformers are original - 1) Triad 45249 output transformer (the same one which was used in 5F6-A Tweed Bassman), 2) Choke Schumacher 17th week of 1961, 3) Power transformer 110V Schumacher 17th week of 1961. Original Oxford 10K5 speakers - one has been reconed. They all play fine even in at high volume. The amp comes with non-original harmonic tremolo footswitch and padded cover. The amp is located near Prague, Czechia and I prefer personal pickup.

Service report: 12.1.2026:

1) replacement of all 7 filter caps - 2X TAD F&T Germany, 5X Atom Sprague USA

2) replacement of 5 electrolytic caps in preamp on cathodes - Sprague USA

3) replacement of 2 electrolytic caps in BIAS circuit - Sprague USA

4) 4 yellow Astron caps replaced with replicas (see the photos), the original ones were leaky and are included in the sale. The Blue Molded Ajax caps are not leaky

5) replacement of ceramic disc cap at the input to the inverter NOS vintage Cornel Dubilier

6) 3 replaced resistors at the input to the inverter - 2x NOS vintage USA Allen&Bradley carbon comp, 1x NEW Japan kamaya carbon comp

7) replacement of both 6L6 OCTAL sockets - 2x OCTAL OMRON PL vintage style black phenol socket + 4x NOS vintage USA Allen&Bradley carbon resistor

8) grounding directly to the chassis - 5 ground connections from preamp, ground wire of power cord soldered directly to chassis

9) cleaning chassis from greasy dirt inside and outside

10) measuring power and output transformer - both tested fine

11) measuring all resistors in amplifier

12) "retension" and spraying all 6 NOVAL sockets and potentiometers

13) assessing condition of existing tubes - new 1x pair TAD 6L6WGC-STR Blackplate, 1x Tung Sol 12AX7 Reissue Russia Balanced in V5

14) slowing down the overall speed of tremolo - 1x NOS ceramic disc cap

15) installing new 6L6 tubes and setting BIAS - 33.9 mA, 34.3 mA

16) measuring voltage in amplifier

17) replacing speaker jack with cable - Switchcraft made FENDER jack 90° with plastic cap "F"

18) 10nF cap in VIBRATO at V5 tube was replaced - the original was a microfonic

This item is sold As-Described

This item is sold As-Described and cannot be returned unless it arrives in a condition different from how it was described or photographed. Items must be returned in original, as-shipped condition with all original packaging.Learn More.

Listed3 months ago
ConditionVery Good (Used)
Very Good items may show a few slight marks or scratches but are fully functional and in overall great shape.Learn more
Brand
Model
  • Concert 6G12-A Brownface 40-Watt 4x10" Guitar Combo
Finish
  • Brown
Categories
Year
  • 1961
Made In
  • United States
Color Family
  • Brown
Model Family
  • Fender Concert Amp
Power Tube Type
  • 6L6
Series
  • Fender Vintage Brown / Blonde Amps
Speaker Configuration
  • 4x10"
Number of Channels
  • 2 Channels
Electronics
  • Tube
Direct Output
  • No Direct Output
Number of Inputs
  • 4 Inputs
Reverb
  • None
Output Power (Watts)
  • 40

Product safety information may be available here.

Jan's Fine Guitar Gear Corner

Dobřichovice, Czechia
Joined Reverb:2018

Reverb Protection

Simple Returns, Secure Transactions, Human Support

Learn more

Secure Checkout

Promoted similar listings













Product reviews

Reverb Gives

Your purchases help youth music programs get the gear they need to make music.

Oops, looks like you forgot something. Please check the fields highlighted in red.