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 settings. 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. If you want to use THESE tubes I would disconnect the bias voltage going to pin 1 and recheck that you are still seeing bias voltage on pin 5!
I bought a YBA-3 new in '68 with 2- 4X12 huge open back cabs for The ad I saw before purchase stated it was rated at watts!! I think the cabs had Goodman speakers. The cabs had a removable dolly boards and the amp had a "T" bolt to secure it to one of the cabs. If you see one of these cabs that's the reason for the threaded insert on top.
These were the day's when bigger was "far out". They also had a smaller closed back version with what I was told were Norelco? Pete had a good thing goin for him. They also had a 6? Ampeg 8X10 coffins came out later.
The amp would stay clean at full throttle. I used a Silvertone as a preamp set up on top the amp with a dummy 8 ohm resistor, and resistors in series to drop the output signal voltage to around. I'm 5''6" it was all I could do to reach the preamp for adjustment. A lot of guys were doin' similar things to get crunch out of Twins etc. It was freakin' awesome, and a Marshall killer. I had the Traynor checked by a tech after an intermittent transformer problem. With a new transformer it didn't clip till 98 watts.
I used this set-up till the early 90's. The amp disappeared after a show one night and I was heart broken. I still have the Silvertone. I will say the only thing that I could find to duplicate the sheer power of the Traynor was a Rivera M which I bought as a replacement and still have in my collection. Nothing topped the YBA-3 amp for clean power and tone for days. I still remember the photo of Pete tossin' the amp to prove its reliabilty.
Clean out the broken tubes, re-tube it and play on. Most of the plastic logo's broke off of these amps and cabs so it wasn't unusual to see "raynor's", "Trayno" or "rayno" logos swinging when you moved them.
I say so long to a very reliable and good friend. It shared a lot of great memories with me. De Roche Sound sound is solid and clean; if you need distortion you'll have to add it with a pedal; I play hard rock; The sound is loud clean and fat, and can compete easily with any today bass amp reference especialy plugged into SVT cab. This is especially true with this mod [e.
It's more power than any right thinking guitarist would ever want. It's pretty damned loud. Don't expect to be getting power tube distortion out of it - it's made to be a bass amp. I never modded it because it was perfect for my needs as is. Mine was a , with the master volume, ELs and the ulta-snazzy red in standby and green not in standby power lights Using it for bass and the YBA-1 for guitar is a great idea.
It plays bass with much more authority than the Bass-Master. Although designed for bass, the amp was very handy when extra volume was required. This is not an amplifier for your living room or basement jam sessions. The amp fit the bill for a power trio when you needed to fill the hall. If you are wanting to recreate some of the mid to late sixties power trio experience, this amp will do it.
When that wasn't enough I would throw in two 15" horns. This amp works best with Gibson basses and Fender guitars. The reverse combination does not work as well. I had one of these when they were new serial number about 17 , and basically found it too loud and hard to distort for my style. Eventually traded [it] for a Bass-Master. The sound is solid and clean. If you need distortion you'll have to add it with a pedal. Very heavy but what a great sound! I have an YBA-3 with 8x10s in the cabinet.
It will make your neighbors think the end of the world is at hand. Reliability this amp used to be totally reliable To gig I bring this amp and a Ampeg V4B but I could use it alone it never broke down. Wiring is like old Fender, road proof, schematic is stick on chassis cover so you can have service in any shop. The tube plates have never shown any red, and the transformers barely even get warm to the touch.