Hiwatt Super Hi 50 clips

  • Thread starter Thread starter RedPlated
  • Start date Start date
FourT6and2 said:
Yeah that sounds better than the last one. btw, I'm not sure that schematic on SLO Clone is "official". Like... what's up with the Chinese? When I bought mine, it was quite literally hand-wired in England when I ordered it. Not sure how someone got their hands on a schematic from a Chinese company.
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Yeah, this is true. Who knows what they’re supposed to be.

I do like the 250KA better, though. I’m glad too, because I really don't want to swap out those upside down, parallel wired pots again.

I noticed the Chinese going on with that schematic. Maybe Hiwatt is owned by a Chinese company? Or maybe they were hired to do the schematic? Definitely weird.

Seeing as how there were changes between NAMM version and production, these values could have been changed last minute. But, everything else on the schematic seems accurate so I’d imagine the master values should be too.

If this were to be changed to a single master, it’d be a 50K pot to get the same response as the parallel 100K’s. That just seems silly to me. 250K’s just make way more sense. Parallel 500K make even more sense!
 
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Hiwatt does do a Chinese line and there were rumors of a cheaper version of the Chinese Super-Hi model that was supposed to be added to the lineup so could be that as well.
 
RedPlated said:
Yeah, this is true. Who knows what they’re supposed to be.

I do like the 250KA better, though. I’m glad too, because I really don't want to swap out those upside down, parallel wired pots again.

I noticed the Chinese going on with that schematic. Maybe Hiwatt is owned by a Chinese company? Or maybe they were hired to do the schematic? Definitely weird.

Seeing as how there were changes between NAMM version and production, these values could have been changed last minute. But, everything else on the schematic seems accurate so I’d imagine the master values should be too.

If this were to be changed to a single master, it’d be a 50K pot to get the same response as the parallel 100K’s. That just seems silly to me. 250K’s just make way more sense. Parallel 500K make even more sense!
Click to expand...

Aren't they separated, electrically? They're on a relay just like the gains.
 
technomancer said:
Hiwatt does do a Chinese line and there were rumors of a cheaper version of the Chinese Super-Hi model that was supposed to be added to the lineup so could be that as well.
Click to expand...

Oh. Yeah maybe they had that company create the schematic when they planned to make a cheaper PCB version? But how did that guy on the other forum get his hands on it? So mysterious lol
 
Sounds great to me. @RedPlated , I have a Hiwatt DR103 homebrew that I will rarely ever play...just not a tone I'm into. How difficult would it be to put this circuit in a DR103 clone?

I'd have to shoehorn a loop in there as well.
A3-BA46-D5-5-DD3-47-E1-B4-AA-9-E1-FDA17-C47-B.jpg
 
FourT6and2 said:
Aren't they separated, electrically? They're on a relay just like the gains.
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They’re still in parallel. Only the wiper is separated by the relay.

I run my dual masters the exact same way in my amps. Both wipers go to a relay. I have to double the pot value to get the desired resistance. I’ve tested this extensively. It’s just like adding a resistor across the outer lugs to reduce a pot’s value.

SpiderWars said:
Sounds great to me. @RedPlated , I have a Hiwatt DR103 homebrew that I will rarely ever play...just not a tone I'm into. How difficult would it be to put this circuit in a DR103 clone?

I'd have to shoehorn a loop in there as well.
A3-BA46-D5-5-DD3-47-E1-B4-AA-9-E1-FDA17-C47-B.jpg
Click to expand...

I don’t think it’d be difficult at all. That layout looks almost the same as the Super Hi. It’s a very cool circuit and the schematic on SLOclone is great.
 
If someone redraws the schematic for a single gain, single master, no relays, etc. Maybe just the 4th stage on a push/pull, I can finish/update the layout I started. Would be easy to build from a DR504 kit.
 
RedPlated said:
Yeah, this is true. Who knows what they’re supposed to be.

I do like the 250KA better, though. I’m glad too, because I really don't want to swap out those upside down, parallel wired pots again.

I noticed the Chinese going on with that schematic. Maybe Hiwatt is owned by a Chinese company? Or maybe they were hired to do the schematic? Definitely weird.

Seeing as how there were changes between NAMM version and production, these values could have been changed last minute. But, everything else on the schematic seems accurate so I’d imagine the master values should be too.

If this were to be changed to a single master, it’d be a 50K pot to get the same response as the parallel 100K’s. That just seems silly to me. 250K’s just make way more sense. Parallel 500K make even more sense!
Click to expand...

Remember the masters are downstream of a 470k/10k divider, so the master pot value in this position should be something low since the master control is in parallel to the 10k resistor. Making the pot larger only makes that 10k value go from about 9.1k (100k in parallel) to 9.6k (250k in parallel). I.e. - it'll do nothing, so i'm not sure why you have a tone difference, unless you have something in the loop. Then you are changing the input impedance of the loop which will possibly affect the tone.

The divider is there because the passive loop is before the masters. A better option would be to eliminate the divider, use a 500k-1M regular master value, then put an active loop after the master pot.
 
WarHed said:
Remember the masters are downstream of a 470k/10k divider, so the master pot value in this position should be something low since the master control is in parallel to the 10k resistor. Making the pot larger only makes that 10k value go from about 9.1k (100k in parallel) to 9.6k (250k in parallel). I.e. - it'll do nothing, so i'm not sure why you have a tone difference, unless you have something in the loop. Then you are changing the input impedance of the loop which will possibly affect the tone.

The divider is there because the passive loop is before the masters. A better option would be to eliminate the divider, use a 500k-1M regular master value, then put an active loop after the master pot.
Click to expand...

Yes I’m using the loop.

You can hear a very noticeable difference in those two clips between the two master values. Everything else is the same. This is why I wanted to record a before and after. To eliminate the psychoacoustics phenomenon.

I’ll have to review the schematic to see the divider you’re referring to.
 
WarHed said:
Cool ok - whatever is in your loop is interacting with the change in pot value
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I may put one of my active loops in this amp eventually. Good observations and suggestions on that divider. I just saw it in the schematic.
 
Is this the type of amp you’d theoretically be willing to mod for other people
 
SpiderWars said:
Sounds great to me. @RedPlated , I have a Hiwatt DR103 homebrew that I will rarely ever play...just not a tone I'm into. How difficult would it be to put this circuit in a DR103 clone?

I'd have to shoehorn a loop in there as well.
A3-BA46-D5-5-DD3-47-E1-B4-AA-9-E1-FDA17-C47-B.jpg
Click to expand...
when you get it all figured out make me one....lol...
 
fullthrottlesolo said:
Is this the type of amp you’d theoretically be willing to mod for other people
Click to expand...
There’s isn’t a whole lot done to mine. I made the 4th stage so that it’s switchable by pulling the treble pot, added a bright cap to one of the gains and changed the master values. It’s pretty good as is now.
 
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