This is the 500w head that was available from Ernie Ball in the Audiophile series. It has two switchable 4 band EQ channels, a tube preamp, solid state power amp, mute switch, limiter and DI. Mine is in excellent condition and includes a brand new footswitch.
Here is a link with some info on the HD-500: review (in German)
(rack not included)
(the cool glowing red light in the preamp tube window)
Anyone that was at the EB open house got to hear one of these amps. It was used for the stage rig at the country club Friday night, and it was on stage for the EB artists show Saturday night with Tony Levin and Dave LaRue playing through it (there was also an SVT IIpro, not sure who was using which amp).
Here are some more specs:
- 500 watts @ 4 ohms
- Separate Inputs for Active or Passive Instruments
- Tri-Color Signal Indicator
- Vacuum Tube input stage
- 2 independent Switchable 4-Band EQ Channels
- Tuner Out with Mute Function, Effects Loop
- Adjustable XLR Balanced Direct Send
- Exclusive Loudspeaker Variable Response Control
- Adjustable Limiter
- Footswitchable EQ Channel Selection, EQ Bypass, +6dB Gain Boost, and Mute
- Speakon and 1/4" Speaker Output Jacks
- 2 Space Rack Mountable
- Dimensions: 19"W x 3 1/2"H x 11 3/4"D.
- Weight: 24lbs
Selling for $560 (includes insured 2-day shipping)
Here is a link with some info on the HD-500: review (in German)

(rack not included)

(the cool glowing red light in the preamp tube window)
Anyone that was at the EB open house got to hear one of these amps. It was used for the stage rig at the country club Friday night, and it was on stage for the EB artists show Saturday night with Tony Levin and Dave LaRue playing through it (there was also an SVT IIpro, not sure who was using which amp).
Here are some more specs:
- 500 watts @ 4 ohms
- Separate Inputs for Active or Passive Instruments
- Tri-Color Signal Indicator
- Vacuum Tube input stage
- 2 independent Switchable 4-Band EQ Channels
- Tuner Out with Mute Function, Effects Loop
- Adjustable XLR Balanced Direct Send
- Exclusive Loudspeaker Variable Response Control
- Adjustable Limiter
- Footswitchable EQ Channel Selection, EQ Bypass, +6dB Gain Boost, and Mute
- Speakon and 1/4" Speaker Output Jacks
- 2 Space Rack Mountable
- Dimensions: 19"W x 3 1/2"H x 11 3/4"D.
- Weight: 24lbs
Selling for $560 (includes insured 2-day shipping)