Search found 11 matches

by Bonsaimaster
Sat Jan 06, 2018 3:08 am
Forum: Technical Discussion
Topic: Bias circuit help
Replies: 5
Views: 491

Re: Bias circuit help

Yes sorry its the 180K resistor. and yes the bias voltage across the bias resistor - I replaced the 180K to a 220K and got 6.8mV on one side and 17mV on the other. I cannot get current to equalize on both sides. My understanding is that this is because there is too much negative voltage thus raising...
by Bonsaimaster
Sat Jan 06, 2018 12:26 am
Forum: Technical Discussion
Topic: Bias circuit help
Replies: 5
Views: 491

Bias circuit help

Can someone help me with this bias circuit. I get about 14mV DC with the bias knob completely in one direction and only 5 mV DC in the other direction. I have changed out the 150K resitor to 470k to get this sweep. I need a greater sweep with this circuit. Should I still increase the "150K" resistor...
by Bonsaimaster
Thu Jan 14, 2016 7:32 am
Forum: Trainwreck Discussion
Topic: Switchable Volume and MV
Replies: 13
Views: 2153

Re: Switchable Volume and MV

How about something like this. Not sure how it works. I know it the amp the footswitch cuts the signal. I don't understand JFETs but I presume they slowly make the connection of the resistor to ground. I would love someone to explain how the JFET works in this circuit
by Bonsaimaster
Wed Jan 13, 2016 10:08 pm
Forum: Trainwreck Discussion
Topic: Switchable Volume and MV
Replies: 13
Views: 2153

Re: Switchable Volume and MV

Yes.
Higher Master Volume lower Volume - clean
Lower Master Volume higher Volume - dirty
by Bonsaimaster
Wed Jan 13, 2016 5:40 pm
Forum: Trainwreck Discussion
Topic: Switchable Volume and MV
Replies: 13
Views: 2153

Switchable Volume and MV

Anybody done a switchable Volume and MV for Liverpool? Any thoughts on the best way to wire this option. I know turning down the guitar volume cleans up the sound but a switchable option would give a clean with dynamic headroom.

Thanks
Daniel
by Bonsaimaster
Fri Jan 08, 2016 9:33 pm
Forum: Trainwreck Discussion
Topic: Trainwreck Liverpool and Express Power PCB
Replies: 7
Views: 3270

Re: Trainwreck Liverpool and Express Power PCB

Do you have those ExpressPCB files?

Thanks
Daniel
by Bonsaimaster
Sat Dec 05, 2015 4:25 pm
Forum: Trainwreck Discussion
Topic: Trainwreck Liverpool and Express Power PCB
Replies: 7
Views: 3270

Re: Trainwreck Liverpool and Express Power PCB

Ok no response. Does anyone know how to use eagle PCB software?

THX
by Bonsaimaster
Tue Dec 01, 2015 7:20 pm
Forum: Trainwreck Discussion
Topic: Pre-Express build questions...
Replies: 6
Views: 3108

Re: Pre-Express build questions...

As for chassis they are not going to affect the sound per say. An open chassis does give advantages of separating components. More cooling less crowding are important but there are diminishing returns. Therefore there is an adage of open spacing open sound. As for transformers I have used Classic To...
by Bonsaimaster
Fri Nov 27, 2015 5:56 pm
Forum: Trainwreck Discussion
Topic: trainwreck trafos brand
Replies: 12
Views: 3121

Re: trainwreck trafos brand

I used Classic Tone transformers and they were great. THey have specs for the traniwreck and are click and order. Great stuff.

Daniel
by Bonsaimaster
Mon Nov 23, 2015 10:37 pm
Forum: Trainwreck Discussion
Topic: Trainwreck Liverpool and Express Power PCB
Replies: 7
Views: 3270

Trainwreck Liverpool and Express Power PCB

Does anyone have gerber files for the power section of a liverpool and express power section? If not can someone help me create one?

Thanks
Daniel