Ameson
 
   
 
   
Guitar and Bass Amplification
 
       
 
Production of most of these units has now ceased. A50, Jazz 90, and RS50 Jazz can still be produced to order..
 
 
This page is for information ONLY..
 
       
   
AMESON A50 VALVE (Tube if you live in the fringes) GUITAR AMPLIFIER - ARCHITECTURAL SPECIFICATION
 
    Single channel all valve amplifier with high and low gain inputs, with gain, bass, middle, treble, volume controls.  
    Valve complement to be 2 x ECC83, 1 x ECC81, 2 x 6V6, EL34, 6L6 or KT88 - dependent on model.  
    To be available in 18 Watt, 50 Watt and 75 Watt versions  
   

All components used to be carefully chosen and more than adequately rated for best reliability and performance. And I mean this..

 
    Aluminium chassis for light weight and period low magnetic interaction.  
    Power transformer to be core shielded toroid for maximum power/weight ratio and low noise performance.  
    Output transformer is purpose designed, flash tested to 4kV. To support 4/8/16 Ohm speaker loads.  
    Circuit design to be traditional with my own optimised values. NO presence control. NO effects loop. NO drive channel s**t. NO reverb. NO DFX..  
    Power supply to use solid state rectifiers. The advantage over using a valve rectifier is too great to ignore, both in engineering and playability terms. The more energy in the power supply the better...  
    Custom made FR4 fibreglass turret board construction for easy servicing, and all switching jacks to be Gold plated  
    Build standard to be as impeccable as I can make it.. (See picture below)  
   

Case to constructed from 12mm Birch plywood for strength and lightness, with choice of coverings, styles, and pipings. Style: All credit to Lyndon Laney and Jim Marshall for this one - this is a perfect and acceptable format. And it looks great. Size: 8" x 22" x 8" (HWD). Weight: approx 10Kg.

 
       
     
   
Ameson valve head - standard leathergrain finish
 
     
   
What it looks like inside..
 
       
   
AMESON KGA150 SOLID STATE GUITAR AMPLIFIER ARCHITECTURAL SPECIFICATION
 
       
    Single input two channel switchable design.  
    Overdrive channel controls: Input Gain, Second stage gain (Saturation), Bass, Middle, Treble. Led status indicator.
    Clean channel controls: Volume, Bass, Middle, Treble. Led status indicator.  
    Overall controls: Reverb Level, Presence  
    Footswitchable channel selection and Reverb.  
    Serial FX loop.  
    XLR DI output (Unbalanced, ground lifted by 100 Ohms + 100nF)  
    MAJ traditional Mosfet output stage - 150 Watts rms into 4 Ohm speaker load (100 Watts into 8 Ohms, 70 Watts into 16 Ohms). Open, short, thermal, and bad load protection.  
    Ameson Valve Sound device fitted as standard * See note about this on the "overview" page.  
    Build standard to be as impeccable as I can make it.  
    Case again to be constructed from 12mm Birch plywood for strength and lightness, with choice of coverings, styles, and pipings. Style: All credit to Lyndon Laney and Jim Marshall for this one - this is a perfect and acceptable format. And it looks great. Size: 8" x 22" x 8" (HWD). Weight: approx 10Kg.  
       
     
   
AMESON KGA 150 - Standard leathergrain finish
 
       
   
AMESON MOSFET BASS AMPLIFIER ARCHITECTURAL SPECIFICATION
 
       
    Single channel design with choice of active (low sensitivity) and passive (high sensitivity) inputs. On jacks.  
    Input stage has Gain control and Switchable compressor and Enhance control  
    EQ. Bass control, 7 band low mid - high mid graphic, Treble control.  
    Master Volume control and Limiter defeat switch (your choice boy...)  
    XLR balanced DI output  
    MAJ traditional Hitachi Mosfet output stage - Open, short, thermal, and bad load protection. Available in 190 Watts rms, 250 Watts, or 320 Watts rms into 4 Ohm versions.  
    Build standard to be as impeccable as I can make it.  
    Case yet again to be constructed from 12mm Birch plywood for strength and lightness, with choice of coverings, styles, and pipings. Style: All credit to Lyndon Laney and Jim Marshall for this one - this is a perfect and acceptable format. And it looks great. Size: 8" x 22" x 8" (HWD). Weight: approx 10Kg. 320 Watt version case is same but 12" deep, and weight is 13Kgs..  
    Oh the volume and gain controls go to eleven.. Yes thats right - not 8 or ten - ELEVEN. Must be louder than one that goes to ten then...  
       
     
   
AMESON BASS AMPLIFIER 190/250 Watt - standard small box leathergrain finish

 

       
   
The RS products - Designed and developed in conjunction with Roy Sainsbury
 
       
   
The Ameson RS Jazz 90
 
       
Unbelievable sonic performance and very cost effective.
 
       
    Input stage: Composite two section high impedance input stage with 20X gain. Uses selected audiophile passive components and precision operational amplifiers for superb performance and low noise  
    Equalisation: Three section classic active (Baxandall) network with selected component values for optimised response for guitar.  
    Output stage: Mosfet based output stage for ultra low distortion and noise. Core screened purpose designed toroidal transformer for maximum efficiency.  
    Power output: Minimum load recommended load impedance is 8 Ohms. Amplifier produces 85 Watts rms into 8 Ohm speaker load, 60 Watts rms into 16 Ohm load (at clip point). Operation into loads of less than 8 ohms is possible at LOW level only, due to possibility of overheating of the case. (Dedicated 4 Ohm or 16 Ohm versions may be available in the future at extra cost)  
    Effects Loop: Series loop preceding power amplifier and line output jack (Sensitivity: 0dB) Gold plated switching jack. For use with unity gain ground isolated FX only.  
    Line Output: Sensitivity is 0dB  
    Reverb/on board FX: NO  
   

Voltage: Euro 230V (Supports English 240V and 220V European supplies). American 120V version to order from 12/04/2012

 
    Connectors: All preamplifier jacks are Neutrik items, for maximum connectivity and reliability. Switching jacks are gold plated.  
    Chassis: Aluminium 16swg case for light weight and maximum heat transfer. No self tapping screws here  
    Accessories supplied: Speaker lead - English jack plugs on 2ft Neoprene cable. Mains lead - 2m. moulded with local plug. Spare mains fuse (2A) located in mains inlet fuse drawer.  
   
Serviceability: Roy has asked me to point out that these amplifiers are hand built in England, and can thus be serviced or repaired now or in 50 years time by ANY half qualified engineer sporting a pair of hits or tands. (Brain preferable, but probably not absolutely neccessary in most cases...)
 
       
   
 
   
The Ameson RS Jazz 90
 
    "Jazz guitarists are a pernickety breed regarding amplifier choice. After all, the amplifier/loudspeaker is virtually half the instrument and the best guitar in the world will not sound great with inferior equipment. I think I am right in saying that most jazz players require these qualities from an amp:-

Warm, clean sound.
Sweet sounding throughout the range,especially the treble.
Clean chord sound with good definition.
Crisp, warm bass register.
Lightweight.

Michael has now come up with the ideal individually made amp head. I chose an arrangement of a great standard, "Someone to watch over me", to demonstrate how beautifully this amp delivers the above qualities - and his new Electro-voice DVX loaded cabinets are simply amazing.."

Roy Sainsbury

 
       
   
The Ameson RS Electrovoice DVX 112 cabinet
 
       
   
Loudspeakers and cabinets are usually listed on the"Loudspeakers" page, but given the association with the Jazz 90 amplifier I have listed this product here.
 
   

The Ameson RS 1 x 12" cabinets have the following specification, and are available in the UK ONLY.

 
       
    1) Dimensions are: 15.3" x 15.3" x 8" approx. Third split open back design.,  
    2) Material used is 12mm birch ply for the sides and back of the enclosure, 15mm Birch ply for the baffle board. Dark brown Tolex with Basketweave fretcloth.  
    3) Standard basketweave vynide covering with beige woven pattern fret cloth (91% air transfer). Heavy duty carrying handle and protective metal corner pieces. 15mm Rubber feet.  
    4) Exclusive MAJ Electronic Anti-feedback lining to all four inner sides of the carcass. No questions PLEASE. It took me a damm long time to find a material that actually works well to inhibit feedback from electro-acoustic instruments. Make your own tests - Or why not try the Forum (used to be some good films on there...)  
    4) Double jack input connector plate.  
    5) DVX cabinet is loaded with an EV Electrovoice DVX3012 8 Ohm loudspeaker chassis. The sonic response and detail from this drive unit is absolutely incredible. (The EV Electrovoice DVX3012 is actually a high power (500 Watts rms!) state of the art Bass/mid driver, but just happens to sound absolutely excellent on Jazz guitar - see demo)  
       
   
 
   
Front view of the Ameson RS DVX112 cabinet
 
       
   
Ameson RS Tube 50 Valve Amplifier Specification
 
       
    Input stage: ECC 83 Voltage amplifer/buffer, ECC81 driver stage  
    Equalisation: Three section classic Mullard/RCA network with selected component values for optimised response.  
    Output stage: 2 x 6L6 selected output valves working into purpose designed English made output transformer. Core screened purpose designed toroidal mains transformer for maximum power and efficiency. 50 Watts rms into 4/8/16 Ohm loads.  
    Voltage: Euro 230V (Supports English 240V and 220V European supplies).  
    Connectors: All preamplifier switching jacks are Neutrik gold plated items, for maximum connectivity and reliability.  
    Chassis: Aluminium 16swg case for light weight, maximum heat transfer, minimum magnetic leakage. No self tapping screws here  
    Accessories supplied: Speaker lead - English jack plugs on 2ft Neoprene cable. Mains lead - 2m. moulded with local plug. Spare mains fuse (2A) located in mains inlet fuse drawer.  
    Dimensions: Standard version measures 22" x 8" x 8" and weighs just 20lb. RS miniature version measures 13" x 8" x 8".  
    Cosmetics: The same as Ameson 50 Watt valve amplifier, choice of finishes etc.  
       
   

"This is simply the most beautiful sounding valve amp I have ever heard. Its warm big sound compares favourably with the vintage amps of the 1940's and 50's but with a much higher output suitable for today's musical situations. It is very light and compact weighing in at only 19 pounds. Being completely hand-assembled and wired, it is not cheap, but why would you ever need to buy another amp again". - Roy Sainsbury

"I am lucky enough to own both the Ameson RS 120 and the Ameson RS Tube 50 amps and both are superb. I have just completed recording a CD with trumpet great Bruce Adams and the engineers at the studio were absolutely bowled over by the sound of the amp. Please feel free to quote me" - Tony Marshall (Tony works with many world class jazz musicians such as Warren Vache, Scott Hamilton, Kenny Baker, etc. His brilliant new recording with Bruce Adams is now on release.)

 
   
P.S. I am only prepared to make these units to special order, prepaid, and delivery time is about 3 months - M.A.
 
       
   
Future production of the miniature version will have a metal cage in lieu of the wooden box. This reduces weight, and improves heat transfer. The cage can be retro fitted to existing examples of any small chassis (miniature) RS50 Tube amplifier.
 
       
   
MAJ Public Address and specialist products
 
       
    Showman De Luxe Preamplifier 1U rack mounting, 2 microphone channels, 2 music channels, 1 aux. channel. Autofade, dual channel mono output.  
    PA1000 150 Watt 5 channel with switchable Reverb and Auxiliary sends. Lo-Z bal. XLR/Hi-Z Jack inputs. CD/MD/Tape input. Mosfet. Reliable, Serviceable  
    PA3000 200 Watt 8 Channel with switchable Reverb, Auxiliary and Monitor.   Lo-Z bal. XLR/Hi-Z jack inputs. 4 CD/MD/Tape inputs. Graphic.  
    PMA112120 Watt powered monitor. 1x12" loudspeaker + piezo horn. Volume, bass, treble, and anti-feedback control. Input, link and extension speaker sockets. Mosfet  
   

KT1000 500Wrms + 500Wrms into 4 Ohm loads. Bipolar. Honest rating. All made here. Not imported. Totally serviceable. Fine on generators.

 
     
 
   
Thank you for still being here...
 
       
   
BASIC MODEL RANGE:
 
       
    Ameson 5/18 Bedroom/Pub Special - 5 Watt (6V6) - 18 Watt (6L6) Valve head  
    Ameson 30 Watt AC30TB head clone (4 x EL84)  
    Ameson 50 Watt Valve head - 6L6 or KT88  
   

Ameson 75 Watt Valve head - KT88's

 
    Ameson KGA 150 Solid State  
    Ameson Bass Amplifier 190 Watt  
    Ameson Bass Amplifier 250 Watt - small box as 190 Watt  
    Ameson Bass Amplifier 320 Watt  
    Ameson RS Jazz 90  
    Ameson RS Electrovoice DVX 1 x 12 Cabinet  
    Ameson RS Tube 50 Standard  
    Ameson RS Tube 50 Miniature (Metal cage).  
    Showman De Luxe Preamplifier  
       
       
       
       
   
TO GO TO THE AMESON "OVERVIEW" PAGE PLEASE CLICK HERE
 
       
   
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