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Features one channel and two inputs; volume, bright, treble, treble expander, bass, bass expander, bright switch, deep switch, stand-by switch, pilot light for stand-by and operate.
This amp was built to play larger halls and outdoor concerts. The lack of reverb was not a big issue as most live performances had acoustics full of reverberation halls, arenas. Peter Traynor built these things to stand up to road abuse, unlike a lot of vintage stuff.
It sounds great with either bass and guitar, providing a clean and loud tone. Works great in large club 2b or not 2b by david. Front panel has two input jacks, controls for treble boost, volume, treble expander, treble, bass expander, bass, presence, and bass boost.
There is also a standby switch and corresponding green and red pilot lights.
There are no effects in this head, but stomp boxes work just fine. The front of the amp is wrapped in a Fender-style silver-face cloth [ There is also a cooling fan installed. With tubes, you'll get about W from the Custom Special. Original tube [complement] was three 12AX7s and four 6CA7s that I swapped for s very easy, just boost bias about ten volts in order to have 30ma idle Original input resistor was k and I changed it for 5.
Can be converted from to EL34, I think a pin jumper is needed. The schematic for my '69 Custom Special says to use an 8 ohm load. However, if you take a look at Traynor's advertising from the period, they seem to recommend cabinet combinations which would result in loads as low as 2 ohms as I recall My amp makes around watts into an 8 ohm dummy load, and into 4 ohms.
I have trouble with [the] suggestion that it produced watts, however. I don't think switching to s will make the transformers any hotter.
This amp won't fit easily in the backseat of modern cars forget the trunk, you'll need a van or a pick-up. I have been playing bass guitar for almost 40 years. It has great tone and plenty of volume.
It is heavey but it's lighter than an SVT and less expensive. I own 3 of these heads and they are from and 69 non-master volume. The non-master volume heads have chokes in them. The low end and low mids are lush, very tubey.
The tone cuts right through the band in a very full and pleasing way and fills any voids. I have the tubes biased at 30 ma. The only thing the head needed was more low end, every thing else was there.
Almost all the bypass caps are. The last two caps at the phase inverter bias feed are. Ampeg had these on many amps. Also at this location are two k bias feed resistors or at least their should be change the two k resistors to k resistors.
This will help the tube deal with the high voltages. On EL34 tubes pin 1 is an active pin. It is tied to a grid. Pin 5 sees normal bias voltage and if you look you'll see all of pin 1's looped together off the circuit board.
It takes the bias voltage from the right side of the circuit board and loops to every pin one and then goes back to the circuit board completing the circuit.
When the amp is in the standby mode it sees about volts of bias.
When you turn the amp on the bias voltage comes down slowly, takes about 60 seconds. This way the tubes are protected from the surge of dc power going to the power tubes.
The amp will sound fuzzy and distorted until the bias voltage fully drops. So you have bias voltage on pins 5 and 1. This is how Peter Traynor wanted it. It makes the amp cleaner and more stable.5.
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