The Tube Imp - Mini Tube Tester
Moth group are pleased to announce the availability of the Tube Imp
mini tube tester. Designed and built in the UK, the Tube Imp measures
the steady state current, gain and transconductance characteristics of
any B9A double triode tube with the standard ECC83/ECC88 Footprint
Operating at 12VDC from the included external power supply, the Tube Imp offers matching and parameter testing of a range of commonly used
double triode valves at a price that is affordable to individual valve equipment enthusiasts as well as retail outlets small OEM concerns.
It is is supplied in a convenient and sturdy plastic carry case.
HT Voltage maximum: 200 Volts
HT Voltage adjustment: 0-200 Volts
HT Setting accuracy: Typically better than +/-2%
HT Current: 10mA max
HT Impedance on Gain setting: >1Meg Ohm
Grid Voltage range: 0 to -10 Volts
Grid Voltage setting accuracy: Typically better than +/-2%
Heater Voltage: 6.3/12.6volts DC switchable
Heater Current 350mA, 500mA for less than 5 mins
Cathode Current: +/-2%
Gain: (Anode Impedance in K Ohms)+/-5%
Valves that can be tested:
ECC81/12AT7 ECC82/12AU7 ECC83/12AX7
ECC88/6DJ8WA/6922 ECC189 ECC803
This product is an essential accessory if you own valve kit with B9a double triodes in it. Thats it.
As I said in the introduction: this is a no brainer, if you own components that feature only B9a double triodes like the ubiquitous ECC83 (aka 12AX7) and ECC88 (aka 12AT7 and 6922) you should buy one of these. If you own a $4000 pre-amp you probably connected it to your power-amp with at least a $400 cable pair. Before you ever consider spending that again on next months flava cables buy a Tube Imp to keep your pre-amp in tune. If your power-amp features B9a double triodes as input valves, phase-splitters or drivers a Tube Imp will be worthwhile just to make sure those phase-splitters are spot on to minimise one of the nastiest distortions.
Then you can also use your Tube Imp to help you safely begin the noble art of tube rolling. It wont tell you why overpriced Western Electrics really are worth 4 times the price of Chinese rivals (different bases again) but it will enable you to keep all those miniature double triode components singing. Now you know what to spend your Christmas money on.
Mark Wheeler - TNT Audio (UK) Jan '08
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