Author Topic: pix of Custom built guitar amps/cabs  (Read 420476 times)

Ice-9

Re: pix of Custom built guitar amps/cabs
« Reply #960 on: May 01, 2022, 03:12:53 PM »
I also have amp build projects... But it lags, lags, lags...  >:( >:( >:(

With some others, this one is still sleeping :



In the small department, my Radio-Tone has a new advertising career for py part time amp repair job as a business card display :





In the big department, my Serial Tone Killer is now finished and operational... Not less than five years later its inception :



















Lagging, did you say ?  ??? ;)

A+!

This is one lovely looking amp. :)
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thomasha

Re: pix of Custom built guitar amps/cabs
« Reply #961 on: May 01, 2022, 04:54:39 PM »
Quote
What kind of OT did you use? I was thinking of making similar amp, but wasn't sure where to get an OT. :(
it's a 10W 100V line transformer. I used the 0, 2.5W and 0.625W taps for the primary and an 8 ohm speaker at the 4 ohm tap, to get the 32k primary.

rankot

Re: pix of Custom built guitar amps/cabs
« Reply #962 on: May 02, 2022, 12:38:21 AM »
Quote
What kind of OT did you use? I was thinking of making similar amp, but wasn't sure where to get an OT. :(
it's a 10W 100V line transformer. I used the 0, 2.5W and 0.625W taps for the primary and an 8 ohm speaker at the 4 ohm tap, to get the 32k primary.

Just to check if I got you right:

0, 2.5W and 0.625W are used as primary to load tubes and you connect 8 Ohm speaker at the 4 Ohm tap? And the primary is 32k in that case? What is 2.5W, is it center tap then?

Is it something like this? https://www.parts-express.com/70V-10W-Line-Matching-Transformer-300-040
« Last Edit: May 02, 2022, 12:40:03 AM by rankot »
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thomasha

Re: pix of Custom built guitar amps/cabs
« Reply #963 on: May 02, 2022, 04:35:54 PM »
Yes, 0 and 0.0625w taps are connected to the plates and 2.5w is the centre tap. 

The one you sent is a 70v line transformer, you want a 100v one, like this one here:https://www.visaton.de/en/products/public-address/accessories/tr-1016

rankot

Re: pix of Custom built guitar amps/cabs
« Reply #964 on: May 03, 2022, 04:39:12 AM »
Yes, 0 and 0.0625w taps are connected to the plates and 2.5w is the centre tap. 

The one you sent is a 70v line transformer, you want a 100v one, like this one here:https://www.visaton.de/en/products/public-address/accessories/tr-1016

Thanks! Now to find a source for that one! :)
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stallik

Re: pix of Custom built guitar amps/cabs
« Reply #965 on: May 12, 2022, 07:10:59 AM »
I stumbled on this at a recent guitar show. Thought it looked really neat
Trying to recall the maker..

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bluebunny

Re: pix of Custom built guitar amps/cabs
« Reply #966 on: May 12, 2022, 09:44:56 AM »
Very neat indeed, Kevin.  I can see "Dover Custom 20" in that oh-so-black chassis.
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vigilante397

Re: pix of Custom built guitar amps/cabs
« Reply #967 on: May 12, 2022, 10:08:06 AM »
I stumbled on this at a recent guitar show. Thought it looked really neat
Trying to recall the maker..



That is GORGEOUS. Zoomed in it looks like most of the components just have black heatshrink over them, but a few (notably the larger electrolytic caps) look like they may have been painted? Either way a killer look. I think this should be the standard instead of gooping circuits you don't want traced.
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thomasha

Re: pix of Custom built guitar amps/cabs
« Reply #968 on: May 12, 2022, 02:23:50 PM »
Just to add a video of the amp in action:

Ben N

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Re: pix of Custom built guitar amps/cabs
« Reply #969 on: May 19, 2022, 12:19:47 PM »
That is GORGEOUS. Zoomed in it looks like most of the components just have black heatshrink over them, but a few (notably the larger electrolytic caps) look like they may have been painted? Either way a killer look. I think this should be the standard instead of gooping circuits you don't want traced.
Hmmmm.  :-\ Putting heatshrink on resistors in a hi-voltage amp doesn't strike me as the best way to manage heat.

vigilante397

Re: pix of Custom built guitar amps/cabs
« Reply #970 on: May 21, 2022, 03:43:39 AM »
That is GORGEOUS. Zoomed in it looks like most of the components just have black heatshrink over them, but a few (notably the larger electrolytic caps) look like they may have been painted? Either way a killer look. I think this should be the standard instead of gooping circuits you don't want traced.
Hmmmm.  :-\ Putting heatshrink on resistors in a hi-voltage amp doesn't strike me as the best way to manage heat.

The resistors shouldn't be dissipating much heat to begin with, if the resistors in your tube amp are getting hot enough to worry about managing heat then you have a problem.
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thomasha

Re: pix of Custom built guitar amps/cabs
« Reply #971 on: May 21, 2022, 05:11:52 AM »
That is GORGEOUS. Zoomed in it looks like most of the components just have black heatshrink over them, but a few (notably the larger electrolytic caps) look like they may have been painted? Either way a killer look. I think this should be the standard instead of gooping circuits you don't want traced.
Hmmmm.  :-\ Putting heatshrink on resistors in a hi-voltage amp doesn't strike me as the best way to manage heat.

The resistors shouldn't be dissipating much heat to begin with, if the resistors in your tube amp are getting hot enough to worry about managing heat then you have a problem.
I have to agree.
The only resistor that might get hot is the power stage cathode resistor, and maybe the b+ resistors. All the others are normally rated for 1W but will have a really low dissipation. For example, let's say the plate resistor drops 200v at a 1mA current (12AX7) it will only give you 200mW. Normally the voltage drop and currents are way lower.

amptramp

Re: pix of Custom built guitar amps/cabs
« Reply #972 on: May 21, 2022, 07:55:03 AM »
That is GORGEOUS. Zoomed in it looks like most of the components just have black heatshrink over them, but a few (notably the larger electrolytic caps) look like they may have been painted? Either way a killer look. I think this should be the standard instead of gooping circuits you don't want traced.
Hmmmm.  :-\ Putting heatshrink on resistors in a hi-voltage amp doesn't strike me as the best way to manage heat.

This is bad for maintainability as well.  People identify resistors with colour codes or printing for a reason.  We used to have maintainability demonstrations called out in the contract as a task in some of the equipment we made.  A number of faults were placed in a completed device and the test was to see how long it would take to be diagnosed and repaired.  We always assigned our best tech to that test and gave him everything he wanted short of hookers and blow.  For that one day, he was the most important person in the company.  CEO's may come and go but a tech who can ace an M demo is a keeper at any cost.