Friedman/Ceriatone BE/AHD-50 Clone Build

[abbey road d enfer]

And its emitters tied together

OK, I found a schemo, not very legible but it shows clearly the only the bases are connected (in addition to the emitters connected together). Only the b-e junctions are used, as Zeners.

 

[Spencerleehorton]

Yep I had one that I found as well, thanks dude

 

[okgb]

Seeing a real schematic would be nice, I'd rather build off of a schematic than a placement diagram. the zeners are for saturation switch, I've seen references to using actual zeners of different voltages [ 18 or 20v ]

 

[Spencerleehorton]

Getting a little further with this, I've mounted the relays just need to take everything off and cut the gold front panels, mount the turret board then I can wire up!!

 

[Spencerleehorton]

Little update, have taken off all txf and remounted the choke and output txf so that the output txf is further away from the mains txf as per the pictures I've seen of the friedman and the ceriatone versions.
I have also finally mounted the turret board and the other small tag boards.
Have wired up txfs and the tube sockets.
Still got a way to go, all pots and switches I need to wire today then I need to go through all wiring before power up.
I'm using a slightly different buffered fx loop I've made so need to test this as well.

 

[Spencerleehorton]

Little bit further!!

 

[Spencerleehorton]

Case nearly finished

 

[Spencerleehorton]

Still a fair bit to do but defo end in sight

 

[Spencerleehorton]

You can see how I've moved the transformers, the gold aluminium faceplate still to be drilled and put on

 

[Spencerleehorton]

Time to start to power this on and test!!!

 

[okgb]

Did you work off of the ceriatone layout?

 

[Spencerleehorton]

Partly but mostly from the schematic, still got to check everything later this week

 

[Spencerleehorton]

I have done some big printouts of both to compare and both seem to marry up

 

[Spencerleehorton]

My next question, on the schematic R63 is 220k but on the ceratone layout it is 27k?
Also I notice the bias pot on the schematic is 25k where as on the ceriatone its 50k?
Anyone have any comments about this, I'm just powering it all up now so will report my findings

 

[Spencerleehorton]

First power up threw a couple of errors, B+ is now delivering all the way to the 100k at B+5.
Put some valves in and voltages looking respectable but no signal to output txf, so need to trace and see what's going on.
Very close now, I can hear clicks from the switches to the speaker so I'm almost confident it's just a little routing mistake!!

I hope!!!

 

[Spencerleehorton]

Here's a clip on the first working power on, sounds pretty good to start with.
Still need to look at channel and master switching as doesn't seem to work so far?
Rewire the pilot light, face plates.
And bias everything correctly, then continue to rock out!!!!!!

 

[Spencerleehorton]

Need to have a look at these relays as I can get it to switch channels or masters yet?
The gnd doesn't seem to gnd on the layout but is marked gnd on the schematic?

 

[Spencerleehorton]

I found it, the Z marked on the sleeve of the footswitch jack needs a connection to the 50uf 500v cap which is also connected to the pots wire rail, hopefully that will sort it!!

 

[Spencerleehorton]

Need to make a footswitch pedal for this now as well

 

[Spencerleehorton]

All foot switch and fx loop now operating and sounding pretty damn good, just got to set the bias!! dont seem to be able to get a reading on the 1R resistors from EL34 pins 1 and 8 down to gnd?