Here is my Kalamazoo 30w bass combo built in 1965 per schematic that was inside the amplifier.
Wanted to document in case anyone needs to build such an amp.
Mark
Kalamazoo 30w bass combo 1965
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Kalamazoo 30w bass combo 1965
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Re: Kalamazoo 30w bass combo 1965
Nice!
I have worked on a few of those and it's nice that for Bass usage they chose to fix bias it while Ampeg was still in Cathode bias output stage mode with the flip tops!
I usually make that first filter node cap for the plates a 80 mfd!
I have worked on a few of those and it's nice that for Bass usage they chose to fix bias it while Ampeg was still in Cathode bias output stage mode with the flip tops!
I usually make that first filter node cap for the plates a 80 mfd!
When I die, I want to go like my Grandfather did, peacefully in his sleep.
Not screaming like the passengers in his car!
Cutting out a man's tongue does not mean he’s a liar, but it does show that you fear the truth he might speak about you!
Not screaming like the passengers in his car!
Cutting out a man's tongue does not mean he’s a liar, but it does show that you fear the truth he might speak about you!
Re: Kalamazoo 30w bass combo 1965
Recently got it back from a guitar store I was trying to sell it at but they said it was acting up so I need to see what is going on probably just a tube and I don't have any extra of these.
Mark
Mark
Re: Kalamazoo 30w bass combo 1965
Hi Mark
Very tidy example. Interesting seeing the schematic - slight differences from the repro Bass 30 schemes I've seen on the net.
Be curious to know what sort of AC voltages you are getting at the PT secondaries (as well as the B+) if you have time.
(Maybe some of the problem is in those old(?) black sprague electrolytics in the bias supply?)
Cheers
Very tidy example. Interesting seeing the schematic - slight differences from the repro Bass 30 schemes I've seen on the net.
Be curious to know what sort of AC voltages you are getting at the PT secondaries (as well as the B+) if you have time.
(Maybe some of the problem is in those old(?) black sprague electrolytics in the bias supply?)
Cheers
Last edited by tubeswell on Fri Nov 03, 2017 3:55 pm, edited 2 times in total.
He who dies with the most tubes... wins
Re: Kalamazoo 30w bass combo 1965
Pete,
I can write the voltages down sure no problem.
Mark
I can write the voltages down sure no problem.
Mark
Re: Kalamazoo 30w bass combo 1965
Pretty cool
Like a Williamson amp with tone controls....
TT
Like a Williamson amp with tone controls....
TT
Re: Kalamazoo 30w bass combo 1965
I bet the amp looks more like this schematic...
http://el34world.com/charts/Schematics/ ... bass30.pdf
http://el34world.com/charts/Schematics/ ... bass30.pdf