Gregory Tube Amps

By Paul Marossy    
Last updated 8/7/08    

After picking up the Mark X amp, I was intrigued by these mysterious Gregory amplifiers and thought I would do some research as to what they offered and who they were. It's amazing to me that so many models were offered and yet most people have never heard of Gregory amps before! I have almost no information on who they were other than they were allegedly based out of Elizabeth, NJ, and built cheaply made amps in the 60s. They all share the same method of construction with the partial chassis and enclosure design. Anyhow, I have had a little more success in finding out what they manufactured. Here is what I have found thus far.

Here's an update (8/7/08): I have recently obtained a copy of the brochure that was included with a Gregory Amp which states the company address as being in Bronx, NY. It also says "Amplifiers from $33.00 to $229.95" on it, and includes a list of Gregory Amp service reps in various states.

Model 1500

	This is the Model 1500, which appears to a two channel combo amp something like a Fender Twin Reverb.
	Here is a view of the top of the amp. Not sure of the control layout.
	This a view of the back of the amp. The chassis construction in this amp is very similar to the Mark X. This appears to be a 2x10 combo.

Mark X

	This is the Mark X, a 1x12 combo amp with tremolo. About 10-12 watts of output power.
	Here is a view of the back of the amp. Tube compliment is a 6CA4/EZ-81 tube rectifier, a pair of 12AX7/ECC83s and a pair of EL84/6BQ5s.

Mark XX

	This is the Mark XX, what appears to be a 2x12 combo amp with tremolo. This basically looks like a Mark X with two speakers but has two channels, and is also has about 10-12 watts of output power.
	Here is a view of the back of the amp. I believe that the tube compliment the same as the Mark X - a 6CA4/EZ-81 tube rectifier, a pair of 12AX7/ECC83s and a pair of EL84/6BQ5s.

Mark V

	This is the Mark V, a 1x8 combo amp with tremolo. About 5 watts of output power. This example has an alnico speaker and the schematic dates from Nov. 3, 1955. Being the Mark X's little brother, it's another very simple design with two inputs, and the same tremolo controls as the Mark X.
	Here is a view of the back of the amp - this one still has the back cover. Tube compliment is a 35W4, 50C5, 12AV6 & 12AU6. It appears to use a single ended circuit.

Mark Six

	This is the Mark Six. It uses a 12AU6, 12AV6, 50C5 and 35W4 tubes in a very simple circuit which includes tremolo. The Mark Two is a sister amp to this one, using only three tubes and no tremolo.
	Here is a partial view of the front panel. Here is a brochure for the Mark Two and the Mark Six, with schematics included..

Apollo 800

	This is the Apollo 800, a 1x12 combo amp that is similar to the Mark X. This one has seen some action! (thanks to Tim Gagan for contributing these pictures)
	This a little closer view of the controls.
	This is the back of the amp. From this view, it looks very similar to the Mark X.

Tiger Amp

	This is a very unusual but kind of cool looking (and good sounding) 10-15 watt amp. From what I can gather, this similar to a Mark X, but with reverb and two channels. No idea on the date of manufacture, but I would guess it's from the late 60s or early 70s. (Thanks to Stacey R. for contributing these pictures)
	This is the left side of the control panel. Channel 1 has reverb (foot switch controlled on/off), a volume and tone control, with high and low gain inputs. Channel 2 has tremolo, adjustable for rate & depth (foot switch controlled on/off), a volume control and tone control, also with high & low gain inputs.
	Right side of the control panel.
	This is the back of the amp. From this view, it looks very similar to the Mark X. The reverb tank can be seen at the bottom of the enclosure.
	This is the back of the amp with the cover removed. This follows the typical construction of these Gregory amps. One 12" speaker which appears to be original. Not sure on the manufacturer of the speaker.
	Here is a closer view of the chassis. This amp uses stripboard construction instead of terminal strip style point-to-point wiring seen in the earlier Gregory amps.
	The tubes used are a pair of 7189 (EL84) power tubes, and three 12AX7s. What is really unusual is that the "Gregory" logo has been printed on these tubes. It appears that this amp uses a solid state rectifier since a rectifier tube is conspicuously absent. To the right of the speaker appears to be the reverb circuitry. The owner of this amp has said that it is a super sounding amp, and that it would also make a great harp amp, too.

Handi Amp

	This is the "Handi Amp", which can be either battery powered or plugged into a 120VAC source. I don't have really have any more data on this one then that.
	This is the back of the amp.

The "Two Fifty"

	Here is yet another model from Gregory. This one is called the "Two Fifty" and appears to be a small practice amp.
	This is closer view of the front panel. Not sure of the date of manufacture, but I would guess late 50s/early 60s.
	This is the chassis. This amp has no power transformer, only an output transformer. It used three tubes and it appears to have an 8" speaker.

Gemini 700

	This is the Gemini 700 amp. Tubes used are a 12AU6, 12AV6, 50C5 and a 35W4. I'm not sure if this is a guitar or a bass amp.

Mercury 600

Very basic guitar amp with just a volume and tone control. Not sure of the wattage, but the tubes used are a 12AU6, a 35W4, and a 50C5. Apparently, this amp uses a transformerless design - kind of like the power scheme found in old radios, which poses potential safety hazards. The tubes also do not sound like they are easily replaced. It appears to use a 6" speaker on unknown origin. It will overdrive very easily from what I have been told.

Model 5000

	This is the Model 5000 bass amplifier. It has one 15" speaker.
	Here is a little closer view of the controls. (thanks to Steve Prange for contributing these pictures)

Mark XXX

This is the Mark XXX bass amplifier. It has one 12" speaker. It appears to use the same tubes as the Mark X - a 6CA4/EZ-81 tube rectifier, a pair of 12AX7/ECC83s and a pair of EL84/6BQ5s. Output power is probably around 15 watts.

60A Bass Amp

This is an all tube head with two EL84s and two 12AX7s. There are two channels. Each channel has a volume, bass, and treble control and and a high and low gain input. Output power is probably around 15 watts.

The "007" Amp

	Here is another amp that looks like it was intended to be a practice amp or a cheap beginner's amp. Tubes used are a 12AU6, a 50C5 and a 35W4. I would guess this amp to be around 5-7 watts. One control: volume, which also happens to have a switch built in it - pull it out and the power comes on.
	This is the inside of the amp with the back cover removed. The speaker is mounted on a piece of pine that the current owner installed in the enclosure. The speaker looks to be about 6" or so. Thank you Marshall H. for providing these pictures and info.

The "Marie Sixteen"

	Here is another amp that I have very little info on that is called the "Marie Sixteen". I'm guessing that it had a single speaker in it. This one was apparently out on the curb on trash day and someone rescued it.
	The Marie Sixteen graphics on the left front panel.
	There is several controls and jacks on the front, but I do not currently know what they all are.
	This is the bottom of the chassis. I have no idea what tubes it uses, but I would guess that it has a rectifier tube, a pair of 12AX7 preamp tubes and a pair of EL84 power tubes. It has a reverb tank, so I assume one of the preamp tubes is for reverb send/return.

My Mark X Page

To My Home Page