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Traynor Guitar Amplifiers
     YBA-2B Bass-Mate
YBA-2B Bass Mate Front

YBA-2B Bass Mate Front

YBA-2B Bass Mate Rear

YBA-2B Bass Mate Rear

YBA-2B Bass Mate Front 2

YBA-2B Bass Mate Front 2

YBA-2B Bass Mate Rear 2

YBA-2B Bass Mate Rear 2

YBA-2B Bass Mate 1st stage mods

YBA-2B Bass Mate 1st stage mods

YBA-2B Bass Mate Bias mods

YBA-2B Bass Mate Bias mods

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Traynor YBA-2B Bass-Mate bass / guitar tube valve amplifier
A 1972 YBA-2B Bass Mate 1x15" 25 watt combo.
This amp designed by Peter Traynor of Yorkville Sound and made in Toronto, Canada in 1972
220-240V mains
Reasonable condition for its age
Sine Wave RMS Power: 25 Watts pre-clipping clean sound, 40 Watts full-clipping @ 8 Ohms
Dual Inputs, VOLUME, BASS, TREBLE controls
15" 8 Ohms 75 Watts permanently attached speaker in sealed/open enclosure
Brand new tubes 2x 12AX7A preamp, 2x EL84/6BQ5 GT outputs
Adjustable bias and the 1st stage high gain modifications
External speaker connector
Dimensions 69cm x 45cm x 25cm
Weight 20kg
Operating Instructions, schematic diagram on the internal wall of the cabinet.
Recently serviced and the latest parameter measurements under the following conditions are:
Line voltage 240 V, VOLUME control up to 10, BASS & TREBLE controls up to 5, input Jack1, frequency 1 kHz, level 7.3 mV (-42.7 dBV)
The signal level before the VOLUME control 563 mV (-5 dBV) with 0.01% Total Harmonic Distortion (THD). The maximum signal level at that point when soft clipping starts with 5% (THD) 5.24V (+14.4 dBV). So the 1st stage headroom 9.3  times (19.4 dB)
Pre-clipping output level with 5% (THD) at 16/8/4 ohms load is 20.3/25.2/17  Watts. So 8 ohms load is optimum.
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