Bajaman DR103 Hiwatt Amp Emulation

A

ac30irons

Active member
Hey all,

Curious to know if anyone has knocked one of these up. I know there was a brother some time back having difficulty’s. This seems to have been resolved by highering the value of the resistor between Pin 6 and 7 on IC1. I would likely put a 20k trim here.

2SK117s are like rocking horse shit in the uk, would likely sub them out with 2SK209s.

Going to knock up a schematic on Eagle when I am back from my trip.

Any considerations would be appreciated.


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There's some bajaman emus that I think only bajaman only ever had working builds of.
Probably a good idea to find some verifications before embarking on any of them.
 
jwin615 said:
There's some bajaman emus that I think only bajaman only ever had working builds of.
Probably a good idea to find some verifications before embarking on any of them.
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So from what I can see the vero is verified, once the feedback resistor was de-bugged.

I’m thinking for the sake of a few £££ I can knock up a pcb and see how it is !
 
I have the AC 30 normal and top boost, SVT, 57, 5150 and the Reactor. All do work. The Reactor needed a nice layout and the 57 sounds strange when used with a humbucker but all work in general. His love for the 2SK117 is a problem nowadays but I switched to J201 or the SMT counterpart.
 
fontoponto said:
I have the AC 30 normal and top boost, SVT, 57, 5150 and the Reactor. All do work. The Reactor needed a nice layout and the 57 sounds strange when used with a humbucker but all work in general. His love for the 2SK117 is a problem nowadays but I switched to J201 or the SMT counterpart.
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Did you build them or buy them built ? I know another place does some layouts for some - I haven’t seen any for the Vox stuff though !

2SK117 - pain ! You can get the SMD counterpart from Mouser which I will likely do, can’t be doing with the faf swapping resistors in and out if I change to another JFet.
 
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2sk117 are used as buffers, so absolutely nothing special about them :) I tossed in j201 in my Baja builds back then because that's all I had. Use any small signal jfet, or even replace them with opamp buffers, it won't make a difference at all sound-wise.
 
fontoponto said:
Build them myself on PCBs from JLCPCB except for the 57 on vero.
I‘m this guy https://www.freestompboxes.org/viewtopic.php?p=300017#p300017 the files are one posts below.
Edit: thanks for the mouser hint. Will check them out when I order again.

And there are layouts for almost all of Bajamans schematics http://effectslayouts.blogspot.com/2018/10/bajaman-ac30-normal-channel.html?m=1
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Thanks man, I’m going to do a layout on Eagle for the Hiwatt and maybe the Soldano. JLCpcb rocks. I can’t quite fathom how they do what they do for so little money. I was pondering on doing yeh Ac30 Normal channel also but I love the ROG Britannia.
Blackboarcult said:
2sk117 are used as buffers, so absolutely nothing special about them :) I tossed in j201 in my Baja builds back then because that's all I had. Use any small signal jfet, or even replace them with opamp buffers, it won't make a difference at all sound-wise.
Click to expand...
Thanks man, saves me the headache of a Mouser order !
 
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