@ Steve

[duesentrieb]

Hi Steve

After triple checking everything (and being confused with some LED wiring) I can't find an error somewhere.

The only thing I would think about is to install an extra transformer for your 6V supply to avaoid popping and overstressing the heater-winding. With 10 relays or so I think its better to use a small 6V AC tranny and use a voltage regulator - just a suggestion though, I know that Peter, back when he modded Marshalls, had no problem to hook 12 ECC83 to a standard Marshall transformer and suck almost 10 Ampêres from it - all of them still running until today of course

 

[Giga]

Question for Steve and/or Olaf: what, if any, program are you guys using to make that drawings ? I'm in the very early stages of planning a board lay-out for an ampbuild and it would be cool to be able to do that on the computer. The crayon and eraser gets real old real fast....

Thanks !

Giga.

 

[duesentrieb]

You have to ask Steve - I'm still a handdrawer, cause I'm too lazy

 

[stephen sawall]

I was just reading some of this yesterday. Very cool. cant wait to hear how she comes out.

 

[Anonymous]

Hi Steve

After triple checking everything (and being confused with some LED wiring) I can't find an error somewhere.

The only thing I would think about is to install an extra transformer for your 6V supply to avaoid popping and overstressing the heater-winding. With 10 relays or so I think its better to use a small 6V AC tranny and use a voltage regulator - just a suggestion though, I know that Peter, back when he modded Marshalls, had no problem to hook 12 ECC83 to a standard Marshall transformer and suck almost 10 Ampêres from it - all of them still running until today of course

That is awesome, Olaf! I'm glad things appear to be correct! So, if I want separate power for the relays, the 6V AC tranny would be like one of these with the correct Ampere rating:

6V AC trannys

Thanks so much for taking all the time to check this out, man. I'm glad the footswitch was correct!

Steve

 

[Anonymous]

Question for Steve and/or Olaf: what, if any, program are you guys using to make that drawings ? I'm in the very early stages of planning a board lay-out for an ampbuild and it would be cool to be able to do that on the computer. The crayon and eraser gets real old real fast....

Thanks !

Giga.

Hey Giga!

I use the free version of Eagle schematic software. Note though that I had to create some of my own components to do tube amp design (the tubes, relays and a bunch of other stuff that didn't come in the libraries. Also the program generates PCB layouts automatically, but it doesn't really handle board layout. For that, most people just use a drawing program like powerpoint or photoshop or illustrator. However, if you want to draw circuit schematics like what I've been posting, Eagle is awesome. Here is a link to the freeware version and it's download page:

Eagle schematic freeware

If you end up getting this, I'd be happy to share my tube amp library with you. Lemme know...

Steve

 

[Anonymous]

I was just reading some of this yesterday. Very cool. cant wait to hear how she comes out.

Well, now I have to punch all the holes in an Marshall 100W blank chassis by hand since mine has way different controls. I also have to have someone make me some custom plexi panels and eventually I'll need a custom headbox when I've got things tweaked the way I like it. I'm excited about this project, though! I'll keep people apprised of progress here!

Steve

 

[duesentrieb]

Hi Steve

After triple checking everything (and being confused with some LED wiring) I can't find an error somewhere.

The only thing I would think about is to install an extra transformer for your 6V supply to avaoid popping and overstressing the heater-winding. With 10 relays or so I think its better to use a small 6V AC tranny and use a voltage regulator - just a suggestion though, I know that Peter, back when he modded Marshalls, had no problem to hook 12 ECC83 to a standard Marshall transformer and suck almost 10 Ampêres from it - all of them still running until today of course

That is awesome, Olaf! I'm glad things appear to be correct! So, if I want separate power for the relays, the 6V AC tranny would be like one of these with the correct Ampere rating:

6V AC trannys

Thanks so much for taking all the time to check this out, man. I'm glad the footswitch was correct!

Steve

It was fun, Steve. I hope you will be successful with this monster

Yeah, those trannies are fine. 1A should be fine.

AC into bridge rectifier into 1000µF electrolytic then 330nF then a 7806 with diode then 220nF - I'll post a schem for a regulated supply.

 

[duesentrieb]

Here:

6V AC instead of 21V
1000µF instead of 2200µF (use a 16 or 25V electrolytic)
330nF
7806 + diode
100nF
1k
diode
= 6V of perfect DC

Place that somewhere close to the PT (f.i. on the side of the chassis on a small board).

 

[Anonymous]

Here:

6V AC instead of 21V
1000µF instead of 2200µF (use a 16 or 25V electrolytic)
330nF
7806 + diode
100nF
1k
diode
= 6V of perfect DC

Place that somewhere close to the PT (f.i. on the side of the chassis on a small board).

Olaf - YOU RULE! Thanks again!

Steve

 

[Anonymous]

It was fun, Steve. I hope you will be successful with this monster

Thanks man! It certainly has been fun so far and I've learned A LOT from your help!

Steve

 

[duesentrieb]

About the punching (if you shouldn't know that already

a) get a stand driller - the slower it turns, the better. adjustable rpm. 100-200rpm is ok.

b) for the socket holes a step driller

and believe me: thats the part I hate the most - drilling into steel

 

[Giga]

I'll give you a tip guys; you need something like this: http://www.dpsbv.com/index.php?eID=tx_c ... e5acee27fd Saves you a drillingmachine and the drill (= expensive)

Giga.

 

[Giga]

Question for Steve and/or Olaf: what, if any, program are you guys using to make that drawings ? I'm in the very early stages of planning a board lay-out for an ampbuild and it would be cool to be able to do that on the computer. The crayon and eraser gets real old real fast....

Thanks !

Giga.

Hey Giga!

I use the free version of Eagle schematic software. Note though that I had to create some of my own components to do tube amp design (the tubes, relays and a bunch of other stuff that didn't come in the libraries. Also the program generates PCB layouts automatically, but it doesn't really handle board layout. For that, most people just use a drawing program like powerpoint or photoshop or illustrator. However, if you want to draw circuit schematics like what I've been posting, Eagle is awesome. Here is a link to the freeware version and it's download page:

Eagle schematic freeware

If you end up getting this, I'd be happy to share my tube amp library with you. Lemme know...

Steve

Thanks Steve, I'll get into that...

Giga.

 

[Anonymous]

About the punching (if you shouldn't know that already

a) get a stand driller - the slower it turns, the better. adjustable rpm. 100-200rpm is ok.

b) for the socket holes a step driller

and believe me: thats the part I hate the most - drilling into steel

I'm all set on this Olaf. I have a set of Greenlee punches for the larger holes (caps tubes), an rpm adjustable bench drill press and a set of specialized cutting tools for the smaller holes. I've already tested all this out on a spare chassis I have at home and I can drill or punch clean holes of all the sizes needed for this amp. I'm going to use an aluminum chassis for the prototype at least...

Steve

 

[Anonymous]

I'll give you a tip guys; you need something like this: http://www.dpsbv.com/index.php?eID=tx_c ... e5acee27fd Saves you a drillingmachine and the drill (= expensive)

Giga.

You'll still need a drill press to use these to get things accurate because you need a real accurate center hole to use those punches and they don't come in small enough sizes for some of the holes. That looks exactly like the Greenlee punches I have...

Steve

 

[Giga]

I'll give you a tip guys; you need something like this: http://www.dpsbv.com/index.php?eID=tx_c ... e5acee27fd Saves you a drillingmachine and the drill (= expensive)

Giga.

You'll still need a drill press to use these to get things accurate because you need a real accurate center hole to use those punches and they don't come in small enough sizes for some of the holes. That looks exactly like the Greenlee punches I have...

Steve

Yeah, I know... I was only referring to f.i. your tubesocket holes and assuming you could drill the smaller ones with a handheld or even a battery drill

Giga.

 

[duesentrieb]

Cool.

But if you should want to add DC heaters, let me know, I've just built them into this very first Einstein-Combo-Proto, which Peter gave me to make an amp out of it again . . .

 

[duesentrieb]

Here's the rectifier with a 10,000µF cap

 

[Anonymous]

Cool.

But if you should want to add DC heaters, let me know, I've just built them into this very first Einstein-Combo-Proto, which Peter gave me to make an amp out of it again . . .

This would reduce hum, correct? I'm certainly interested! How did you do it? Thanks for the pictures, but I have to be honest - with the lighting it is pretty hard to see what is going on...

Steve