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http://www.ozvalveamps.elands.com/rex.htm | Last update:
18:28 08/07/08
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Manufactured by Frank and Anthony Lamberti of General Music
which was a division of Lamberti Brothers in Melbourne.
Correction 22/02/06 thanks to Michael Zaccaria.
Contains:Nathan Jacklin writes that he has a Bassking BA-50, Serial Number: 2025.
New: 23/8/07
Model: ? Serial: 522
It has a sydney made M.S.P hi flux 8 inch speaker (MSP = “Manufacturers Special Products”) with K48/50937 on the speaker cone and BH3 stamped in ink on the metal frame. The valves are original and these are a 6GW8 and a 6V4.
It tested 3.4 volts across the speaker and Graham calculated it to be 3 watts output.
On the oscilloscope the wave shape was biased to positive which makes it a lovely guitar amp, but not so good for keyboards.
The tone control really does make quite a difference, and it seems to get louder as the treble is increased.
There are no markings on the transformer or any dates anywhere i could see apart from the aforementioned marking on the speaker. Graham seems to think it is from about 1961.
Source: Jason Liebeknecht
New: 8/7/08, Serial: 1874
Circuit for Mascot
Source: James Mumford
www.mumfordguitars.com.au
New: 22/4/07
Source: Jordan
New: 9/4/07
Serial: 2598
This Rex BassKing contains 2x EL84 [6BQ5] and 2x 12AX7. It produced excellent clean tones. It starts to break-up at high volumes: 9 and 10. The current speaker is 15 ohms. The designed speaker load is likely to be 6-8 ohms.
Even though there are 2 inputs, Normal and Bass, the circuits behind of these are identical. This is confirmed by the sound produced when plugged into each of these.
My recent repairs include, adding crude metal cover over exposed power transformer solder tags, replacing all tubes, replacing 4 sockets, and replacing 1 electro. All other compoents appear to be original, including the electros. The transformers are unidentifiable - unbranded and unlabelled.
Cabinet construction is 1/2 and 3/4 inch chipboard. It has a sealed box. The top handle is offset to balance the main transformer when carrying.
The speaker is a “MSP Hi-flux 12AU-15”. This is probably not original.
Click for full size, see rollovers.
Serial No 2598
Made in Australia by the General Music Company. The amp is Fenderish in appearance (similar to some Vadii), has a “Bass” and a “Normal” channel each with two inputs Vol, Bass and Treble controls.
All point-to-point wiring, 2x Miniwatt 6CA7's (UK jobs), 3x 12AX7's.
The trannies are strange things; only 2 bolts holding the laminations together, and no end bells. They have a sort of Partridge[*] appearance.
[* a transformer manufacturer]
The Rex amps never achieved the sales or recognition of the Goldentone and Moody brands, but are very similar in overall design, construction methods and tone. This little Rex is a delightful little single-ended valve amp with probably 6 or 7 watts output from its single EL-84 output stage.
The speaker is the original Sydney-made “MSP Hi-flux” 8-inch unit.
Source: Grouse Guitars
Serial: 1116
Build: 1959
Derek Lark takes up the story...
Here is a pretty well kept Rex AG6T guitar amplifier.
Click for full size 49kb jpg
Click for full size 41kb jpg
Click for full size 34kb jpg
Click for full size 64kb jpgThis has a rewound output transformer (quite a big txfr for the wattage) but mostly it has had some new capacitors and resistors fitted. I haven't done any work on it as yet but it will get some of the really old resistors replaced soon as it is getting quite noisy when it heats up.
It is a classic circuit similar probably to some early Fender Champs, 12AX7 preamp, 6BQ5 output and a 12AT7 Tremolo circuit as a nice addition. Probably 6 Watts RMS given the model name.
The Rola 8 inch speaker seems to be as issued from the Factory.
It is Serial Number 1116 and it is supposedly a 1959 build. The speaker certainly has '59 stamped on it.
It sounds great with a lap guitar or an old crystal microphone and harmonica.
You can see its size relative to the Fender Blues Junior.
Source: Derek Lark
Price list for AG6, AG6T, and BA50. (30kb gif) Source: Michael Zaccaria
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