1964 Gibson Hawk GA-25RVT (Similar To GA-19RVT Falcon) - RestoMod

Very Good
$899
$799
12% price drop
+$59Shipping
As low as $37/month with
This seller is open to offers

Reverb Sellers Are Still Shipping

Most items on Reverb are being shipped within 48 hours. Message this Seller if you have any questions.

Shipped From
Leila Vintage Electronics
Truckee, CA, United States
116
Sales
40+
Joined Reverb
2013
Preferred Seller

Find More on Reverb

Reverb Protection

Buy with Confidence – Reverb Protection has you covered

  • Live support from an expert team of musicians
  • Simple and straightforward returns
  • A safe community for finding the gear you want

About This Listing

1964 Gibson Hawk GA-25RVT vintage combo tube amplifier for sale. 2 channels, reverb and tremolo, 15 watts, 1 x 15" speaker. Great Mid-Century Modern industrial design on this amp.

The Gibson GA-25RVT Hawk is similar to the GA-19RVT Falcon, but it features two channels and a 15" speaker. This is the rare early version of the Hawk with a single tone control, a 15" speaker, and a 2x 6V6GT and 5Y3 power section; later versions featured two 10" speakers, treble and bass controls, and 7591 power tubes. 

This is a RestoMod - part restoration and part modification.  Stock - these Crestline-era Gibsons amps sound absolutely terrible.  That's why you've never seen any professionals use them.  However, modify some of the component values and you've got a classic vintage amp on your hands.  I've cleaned up all components of the amp, performed typical maintenance, checked all electrical components, and made some modifications to the circuit to make it sound great.  Specifics are listed below.

Amplifier Specifications
  • 2 channel amplifier with spring reverb and power tube bias tremolo
  • Configuration: 1 x 15" combo
  • Controls: 6 knobs - Ch. 1 Volume, Ch. 2 Volume, Tone, Reverb Level, Tremolo Depth, Tremolo Frequency
  • Inputs: 4 (2 per channel)
  • Tubes:
    • Pre Amp: 4x 6EU7 (low noise redesigned 12AX7), 1 x 12AU7 (reverb driver and phase inverter)
    • Power Amp: 2x 6V6GT in cathode bias
    • Rectifier: 1x 5Y3GT 
  • Speaker: Original 1964 CTS 15"
  • Cabinet: Redwood
  • Power Rating: 15 watts (est.)
  • Size: 26" wide, 20 1/4" tall, 10 1/2" deep
  • Weight: 39 Pounds
Restoration
  • Disassembled entire amplifier and cleaned cabinet covering, inside cabinet, inside reverb tank, speaker cone, outside and inside chassis
  • Serviced the electronics - cleaned and lubricated all jacks, potentiometers, and tube socket pins
  • Inspected and measured all electronic components
  • Replaced all electrolytic cathode bypass capacitors, 6V6 cathode bias resistor, and out of spec power resistors
  • Tightened all hardware
Modifications
  • Background - stock, this is a really weird circuit. As is typical with this era of Gibson amps, the stock circuit features very small value coupling capacitors to bock bass frequencies and a bridged-T notch filter for a steep mid range scoop.  This reduces overall volume, does not allow the amp to distort, and makes it sound very thin and too bright. They designed the tremolo circuit to modulate the grid bias of the Ch. 2 input tube and had to add a series of R/C networks to filter out the tremolo thumping.
  • Pre Amp Mods
    • Increased all coupling cap values to Fender tweed-era specs and removed all notch filters; the amp now sounds like a Fender tweed amp and starts to breakup around 4 on the volume control. 
    • Channel 1 (no reverb) has slightly tighter bass than Channel 2 (reverb)
  • Tremolo Mods - rebuilt the tremolo circuit to modulate the grid bias of the output tubes instead of the Ch. 2 input tube. Tremolo was rebuilt to GA-19RVT Falcon specs. Before, the trem would freak out and stop working with any decent amount of gain. Now you can turn the amp all the way up and it works great throughout the whole volume range. Tremolo also works on Ch. 1 now. moving the trem circuit to the output also reduced the overall background noise level of the amp.
  • Reverb mods - Removed the Bridged-T filter from the reverb circuit, re-voiced the circuit by ear, moved the reverb input to the Ch. 2 volume control. This way it works like a GA-19RVT Falcon in that the reverb level is independent of the volume control - turning the volume control down and reverb level up gives you 100% wet reverb.
  • Upgraded to grounded 3-prong power cord for your safety and less background noise.
This amp is an absolute gem now. Rare model.  Bold and fat tones. Overdriven as you crank the volume. Vintage tube-driven reverb and tremolo. It's just awesome.

Note that all vintage tube amplifiers requires maintenance to work properly. While the amp has recently had the necessary maintenance and component replacement, keep in mind that the vintage components remaining inside the amp can fail from time to time. That is not my fault and I do not take responsibility for component failure in the future. 

This amp is being sold as-is.


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.

Product Specs

Listed2 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
Finish
Categories

Seller Reviews

116

Reverb Gives

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

Carbon-Offset Shipping

Your purchases also help protect forests, including trees traditionally used to make instruments.

iOS app store button
Android play store button