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lavrgs

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...it's cold out there
The automagic welcome is an interesting add. It certainly provides a dedicated space that seems to require filling 8-). I joined because of a search for Top Hat diodes for a JTM 45 build...not sure what they do, as I am considering a build I thought I'd poke around to learn a bit.

I've assembled 3 amps - with the intenston of learning how they work. My first build was an Allen Accomplice which was an easy build due to the excellent instructions but after building,plugging in and playing I realised that what I learned was that I could follow instructions really well...Next was a Mojotone 18 W clone and it taught me that the practical use of Ohms law...ahhh the voltage here should be x and it's low...maybe there a current flow problem... My third build of a 5E3 started with a Boothill board kit and I sourced the other components. I used a Chassis similar to the 18 W so I could use the same cabinet and laid out the components and machined the chassis accordingly - definitely getting more involved in the outcome, which included a cus$tom faceplate set. Next project is going to be a dumblized Champ built into a 1942 radio box....
Further questions will be asked in appropriate forums
 
lavrgs said:
...it's cold out there
The automagic welcome is an interesting add. It certainly provides a dedicated space that seems to require filling :cool:. I joined because of a search for Top Hat diodes for a JTM 45 build...not sure what they do, as I am considering a build I thought I'd poke around to learn a bit.

I've assembled 3 amps - with the intenston of learning how they work. My first build was an Allen Accomplice which was an easy build due to the excellent instructions but after building,plugging in and playing I realised that what I learned was that I could follow instructions really well...Next was a Mojotone 18 W clone and it taught me that the practical use of Ohms law...ahhh the voltage here should be x and it's low...maybe there a current flow problem... My third build of a 5E3 started with a Boothill board kit and I sourced the other components. I used a Chassis similar to the 18 W so I could use the same cabinet and laid out the components and machined the chassis accordingly - definitely getting more involved in the outcome, which included a cus$tom faceplate set. Next project is going to be a dumblized Champ built into a 1942 radio box....
Further questions will be asked in appropriate forums
Click to expand...

Actually, we're collecting your personal information and bank passwords.
Just kidding. :pound-hand:
 
lavrgs said:
...it's cold out there
The automagic welcome is an interesting add. It certainly provides a dedicated space that seems to require filling :cool:. I joined because of a search for Top Hat diodes for a JTM 45 build...not sure what they do, as I am considering a build I thought I'd poke around to learn a bit.

I've assembled 3 amps - with the intenston of learning how they work. My first build was an Allen Accomplice which was an easy build due to the excellent instructions but after building,plugging in and playing I realised that what I learned was that I could follow instructions really well...Next was a Mojotone 18 W clone and it taught me that the practical use of Ohms law...ahhh the voltage here should be x and it's low...maybe there a current flow problem... My third build of a 5E3 started with a Boothill board kit and I sourced the other components. I used a Chassis similar to the 18 W so I could use the same cabinet and laid out the components and machined the chassis accordingly - definitely getting more involved in the outcome, which included a cus$tom faceplate set. Next project is going to be a dumblized Champ built into a 1942 radio box....
Further questions will be asked in appropriate forums
Click to expand...

The top hat diodes are silicon rectifiers. But obsolete.
You can use regular diodes just the same way with no problems. It does the very same thing.
1N4007 is ideal for this type of build.

The diode you want is a " silicon rectifier diode."
But you will have a hard time finding them, since they were replaced long ago.
1610230358705.png
 
Amp Mad Scientist said:
The top hat diodes are silicon rectifiers. But obsolete.
You can use regular diodes just the same way with no problems. It does the very same thing.
1N4007 is ideal for this type of build.

The diode you want is a " silicon rectifier diode."
But you will have a hard time finding them, since they were replaced long ago.
View attachment 56041
Click to expand...
And here is one of our aforementioned amp gurus already at work! ;)

By the way, i was looking up simple mods online for an SLX and who should I see? A suggestion by you on another forum from a long while ago! You mentioned
Change C1 from 1uF to .68 uF. Remove C2 which is 100pf.
Instead of C2, install 3-7 pf 1000V cap between plate and grid of V1a.

This would clear up some of the muddiness?
 
Welcome lavrgs, welcome.
You will find the tophat type diode at Valvestorm Diodes & Rectifiers | ValveStorm
Note that the polarity of these is opposite of the type used in the original JTM45's etc, but it is marked on the side of the tophat body.
Hope this helps. Cheers
Edit:
Here you can see one of the Valvestorm supplied tophat diodes used in the negative bias supply of a Black Flag JTM50 build I did a while back. IMG_20200918_103836.jpg
Great choice of build projects by the way. Cheers
 
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lavrgs said:
...it's cold out there
The automagic welcome is an interesting add. It certainly provides a dedicated space that seems to require filling :cool:. I joined because of a search for Top Hat diodes for a JTM 45 build...not sure what they do, as I am considering a build I thought I'd poke around to learn a bit.

I've assembled 3 amps - with the intenston of learning how they work. My first build was an Allen Accomplice which was an easy build due to the excellent instructions but after building,plugging in and playing I realised that what I learned was that I could follow instructions really well...Next was a Mojotone 18 W clone and it taught me that the practical use of Ohms law...ahhh the voltage here should be x and it's low...maybe there a current flow problem... My third build of a 5E3 started with a Boothill board kit and I sourced the other components. I used a Chassis similar to the 18 W so I could use the same cabinet and laid out the components and machined the chassis accordingly - definitely getting more involved in the outcome, which included a cus$tom faceplate set. Next project is going to be a dumblized Champ built into a 1942 radio box....
Further questions will be asked in appropriate forums
Click to expand...

Welcome, U will find some amp experts here. Good luck on all builds
 
A couple more amp shots... 5E3 and 18 Watt clones. To me the 5E3 chassis looked like a PITA so I used a blank Hoffman chassis and laid it out for the 5E3. It's the same size as the Mojotone chassis for the 18 W clone - now they fit in the same cabs; one head and one comboBoothill 5e3.JPGIMG_1107.jpgIMG_1005.jpg
 
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