Got into work this morning, the sun is shining, birds are singing, slight breeze through the shop with the doors open, about to start another day building guitar amplifiers. No memos, no faxes, no 'compliance' meetings, no synergy workshops, no faff, no BS.
Basically, I'm in a glorious mood and I don't care who knows it (Hello, sailor).
Sooooooo...
I have this old output transformer sitting on my shelf, pulled from a late 70s JMP 2144, it's a Drake 783-257 also found in the Canadian-spec JCM800 2204.
The basic specs are:
Ra-a 3.4k
0-4-8ohm secondary taps (no 16!).
50w OT, designed for 2xEL34s
So, let's build an amp based around this transformer. I'd like to open up suggestions to the forum as to what spec it should be, and I'll pick the ones I like.
My only stipulations are:
- Head
- 50w EL34 fixed bias
The rest is up to you.
Once the amplifier is completed, I'd like to offer it up for a raffle on here with donations to TFB as entry fee, if that's OK with
@TTony?
Suggestions below!
*I no longer offer replacement speaker baffles*
Rift Amplification
Handwired Guitar Amplifiers
Brackley, Northamptonshire
www.riftamps.co.uk
Comments
Many guitars have a re-sale value. Some you'll never want to sell.
Stockist of: Earvana & Graphtech nuts, Faber Tonepros & Gotoh hardware, Fatcat bridges. Highwood Saddles.
Pickups from BKP, Oil City & Monty's pickups.
Expert guitar repairs and upgrades - fretwork our speciality! www.felineguitars.com. Facebook too!
Oh and the raffle idea is both generous and a fab idea....thanks!
Rift Amplification
Brackley, Northamptonshire
www.riftamps.co.uk
Great gesture re the raffle, I'm in
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Rift Amplification
Brackley, Northamptonshire
www.riftamps.co.uk
Maybe on a 2x12 format in a chassis that doesnt weigh more than the moon?
Treble, middle, bass, presence, gain, reverb, fx loop, master volume and a variable footswitchable solo boost.
And a half power switch.
So, preliminary specs are:
- Single channel Hot-rodded Vox-inspired preamp section with Gain, Treble, Mid, Bass, Master, and Presence(or Cut?) controls
- Hiwatt style 50w OP section, with switchable GZ34/SS rectification
- Series FX Loop with level control
- Some form of outrageous boost to melt faces
I'm going to start the circuit design shortlyRift Amplification
Brackley, Northamptonshire
www.riftamps.co.uk