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 Fender Bassman copy build.
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 Return to top of page · Post #: 1 · Written at 8:51:21 PM on 1 April 2024.
Fred Lever's Gravatar
 Location: Toongabbie, NSW
 Member since 19 November 2015
 Member #: 1828
 Postcount: 1267

I'll start a thread here about this project.
I will post a part 1 at an appropriate time once I have enough content.

This will be my last "Woden" Bass amplifier, the name I used back in 1970-1990.
My very first guitar amplifier had 6V6's in push pull with store bought transformers.
The transformer cost was so high, (I was buying at retail) the amp was made at a loss.
That was the main reason I started to wind my own.
Winding techniques were not a problem as I was winding all sorts of things at work, motors, alternators, reactors and so on.
There may have been a little "foreign order" work done at first but once I found out where to buy or cadge small quantities of wire and insulation I kept it all at home. Besides I had moved on at work to different areas out of winding.
Once I had my home workshop built I could moonlight all I liked and made all sorts of music amps, studio desk equipment and magazine kits.
Woden Amplifiers was a great little earner with my mate George hacking out the cabinet's and getting sales, I just made the electronic bits.

Anyway enough of that, this thread is Fender Bassman time, stand by for part 1.

Fred.

Woden Bassman Fender Copy - Part 1
Woden Bassman Fender Copy - Part 2
Woden Bassman Fender Copy - Part 3


 
 Return to top of page · Post #: 2 · Written at 7:13:25 AM on 3 May 2024.
Fred Lever's Gravatar
 Location: Toongabbie, NSW
 Member since 19 November 2015
 Member #: 1828
 Postcount: 1267

I have completed part 1 where I have the basic build firmed up with a chassis made, ready to wire.
The transformers are wound and the circuit finalised.
I will build the chassis and test that for "performance" in part 2.

Then a part 3 will cover finishing the cabinet off, looks like I will cover the box with black leather, I discovered a roll of this up on a shelf.
The boxes I made back in the 70's were 1/2" or 3/4" chip board and the leather covered all the rough work nicely.
Those boxes weighed a ton but back then we were fit and strong and hardly noticed.
No body ever pinched my stage stuff, too heavy to just grab and walk away!
Bass boxes of that weight just sat were you put them and the bit that vibrated was the speaker cones not the front panel like some other cheap rubbish.

I'll work on the chassis slowly and get back with part 2.

Part 1 sent to Brad to pin to this thread.


 
 Return to top of page · Post #: 3 · Written at 6:05:44 PM on 4 May 2024.
Brad's avatar
 Administrator
 Location: Naremburn, NSW
 Member since 15 November 2005
 Member #: 1
 Postcount: 7342

Document uploaded to Post 1.


‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
A valve a day keeps the transistor away...

 
 Return to top of page · Post #: 4 · Written at 7:25:09 PM on 17 May 2024.
Fred Lever's Gravatar
 Location: Toongabbie, NSW
 Member since 19 November 2015
 Member #: 1828
 Postcount: 1267

I have got to finish part 2!

In this I whip the amplifier into working shape and look at fitting the chassis into the cabinet.

That will be a part 3.

I will send part two to Brad to pin to this thread.

Cheers, Fred.


 
 Return to top of page · Post #: 5 · Written at 6:56:31 AM on 18 May 2024.
Brad's avatar
 Administrator
 Location: Naremburn, NSW
 Member since 15 November 2005
 Member #: 1
 Postcount: 7342

Part 2 uploaded.


‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
A valve a day keeps the transistor away...

 
 Return to top of page · Post #: 6 · Written at 6:31:54 PM on 19 May 2024.
BringBackTheValve's Gravatar
 Location: Linton, VIC
 Member since 30 December 2016
 Member #: 2028
 Postcount: 472

Your practice of using a 1 Ohm resistor in series with cathodes is an excellent tip Fred.

This technique can be applied to almost any circuit, and is sure to save many incorrectly set meters from going bang.


 
 Return to top of page · Post #: 7 · Written at 8:05:40 PM on 19 May 2024.
Fred Lever's Gravatar
 Location: Toongabbie, NSW
 Member since 19 November 2015
 Member #: 1828
 Postcount: 1267

Yes BBTV, it was especially handy when wrangling a bank of output valves and detecting the lazy or weak one.
Particularly when using 6 or 8 6CA7 in push pull. (200 to 300 watt)

I would put the valves into a duct to guide the hot air and have test points accessible so I could put a multi-meter on the test points while energised. That way a poor tube could be localised without needing asbestos gloves and trying to swap valves while hot.

Frustrating but there is not one photo or circuit details of any of my big valve amps, no build details at all.
Somehow the paper work and pictures have disappeared, there is a big gap in my build history there.

Fred.


 
 Return to top of page · Post #: 8 · Written at 7:38:33 AM on 5 June 2024.
Fred Lever's Gravatar
 Location: Toongabbie, NSW
 Member since 19 November 2015
 Member #: 1828
 Postcount: 1267

Got the amp to a working point with a Celestion Bass driver and did an evaluation with a Guitarist.
Amp is now finished bar the front panel and cabinet bling.
Have sent a part 3 to Brad to pin to this thread.

Fred.


 
 Return to top of page · Post #: 9 · Written at 6:05:36 AM on 17 June 2024.
Brad's avatar
 Administrator
 Location: Naremburn, NSW
 Member since 15 November 2005
 Member #: 1
 Postcount: 7342

G'day Fred,

My apologies for the time it took to get this one uploaded. All done now.


‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
A valve a day keeps the transistor away...

 
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