Guy77 wrote: ↑Sun Aug 15, 2021 1:31 pm
Beautiful work Bas!
Your boards from the "Don" amp have been running in one of my customers amps and he loves it!
I like the idea of Silver powder coat and black lettering for the Don amp like Joe's B. amp.
But what ever you choose I am sure it will look great!
Cheers
Guy
It's a dilemma Guy! I think the black with gold will look pretty badass, on the other hand a Bonamassa 'signature' amp is pretty cool too! Either way, building both of these amps is a breeze compared to the other Dumble derived amps I did.
You did a pentode/triode switch on your amp with my boards you said. Do you also alter the global negative feedback between the modes. Triodes are considerably lower output impedance than pentodes (better damping factor), so I expect a much flatter frequency response too.
Anyway, I have more stuff coming. I'm working on a deluxe version of the Wonderland, more in line with the Classic Reverb Signature. Fully loaded with foot switchable FET, PAB and reverb, bright, mid, rock-jazz and deep switches. That will be a fun amp too!
rootz wrote: ↑Sun Aug 15, 2021 5:03 pm
Thanks! I do have 2x47uF and 22k in there now. I have to experiment what that combo gets me. The PT is custom build for me, with multiple high voltage primaries, 5V @ 6A, 6.3v @ 7A, 12V @ 0.7A. Really versatile and works with 2x6L6, EL34, 6550 or 4x6V6. That also means I might have to do some experimenting to get the voltages right. If my predictions and simulations are right, the preamp voltages are more in line with what you'd see in an ODS and not as high as in some 002 samples I've seen.
Thanks for the reply rootz. Yes indeed, the voltages on the stack will be pretty much in line with ODS amps, different than SSS 001 through to 004. I have build this preamp a couple times, but never the power amp. I've seen Taylor using both 47uF with 22K or 25K (like you) and 22uF with 15K. I wonder if one is his 6550 and the other the 6L6. I personally like 320-0-320V like the vintage Twin transformers on 6L6, more towards a lower voltage
Looks like I’m on track! The high and low selectors were pretty easy too. They are different ontheven HPD and AN’s version compared to 001, 002 and 004. Just 6 steps. I’m using 2x6 pole switches for that. Works like a charm!
This amp will be running 6V6 to start with. Might have to add a shared screen resistor like the JTM45. If Jim Kelly can run 6V6’s at 460V, why shouldn’t I try to give that a shot?
To be clear if it wasn't: I'm planning to sell all chassis , with or without board sets, once they are finished. As this is not the trade and sell section, this will be the only reference about that here. Keeping it as clean as possible.
As far as the filters I used 7 on mine, for me the more options the better. For some reason memory failed me, I completely forgot that indeed the AN designuses 6 positions
rootz wrote: ↑Sun Aug 15, 2021 7:55 pm
I'm curious: do you use your low filter on the lowest setting, or the high filter on the highest?
In a standard SSS (001 to 004) I find the high filter only usable in positions one to three (but usually I keep max at position two) and the low filter from one to five. But, why keep dumble values if you can make it usable all the way. The low filter I actually like as is, but the high filter I sometimes change the range so it's usable all the way.
There is no reason why you shouldn't adapt the filters to your liking. I did! I like one extreme setting and the rest perfectly usable. I think the 12 (or was it 11) step filters Dumble did were to make them more useable and gradual.
The high filter is where the biggest differences between all of the available schematics are. I see 6 and 7 step filters with or without full bypass, different cap values and with or without a 2n2 or 3n3 cap to ground. The High Planes Drifter and A Taylor's version don't have a cap to ground to dump some high end. Both are 6 step (I do have original ideas, but going 6 step wasn't one of them). Cap values will be where the experimenting begins for me.
Guy77 wrote: ↑Sun Aug 15, 2021 1:31 pm
Beautiful work Bas!
Your boards from the "Don" amp have been running in one of my customers amps and he loves it!
I like the idea of Silver powder coat and black lettering for the Don amp like Joe's B. amp.
But what ever you choose I am sure it will look great!
Cheers
Guy
It's a dilemma Guy! I think the black with gold will look pretty badass, on the other hand a Bonamassa 'signature' amp is pretty cool too! Either way, building both of these amps is a breeze compared to the other Dumble derived amps I did.
You did a pentode/triode switch on your amp with my boards you said. Do you also alter the global negative feedback between the modes. Triodes are considerably lower output impedance than pentodes (better damping factor), so I expect a much flatter frequency response too.
Anyway, I have more stuff coming. I'm working on a deluxe version of the Wonderland, more in line with the Classic Reverb Signature. Fully loaded with foot switchable FET, PAB and reverb, bright, mid, rock-jazz and deep switches. That will be a fun amp too!
Hi Bas. Yes I did the pentode/triode switch on the amp with your boards (and on most all amps these days). It was a flatter frequency response too as you said when switching to that lower output mode. Since all my amps get a global negative pot on the back the user can adjust that pot to compensate.
Too be honest I always prefer the pentode full power mode!
Another very small update. Welded a test chassis this week en got it anodised. It looks so sleek and smooth. Almost happy with this finish. Now onto testing with champagne and black anodising.
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rootz wrote: ↑Fri Aug 27, 2021 6:26 pm
We are going to test with champagne Erwin, or whatever you like and off course show our amps very soon Erwin. Promised!
Hi Bas,
I sent you three P.M. but I doubt that they have not arrived, in my outbox I see that I have two messages sent to you but in brackets like this: Outbox (2).
I admit, I don't know how to use the functions of the site.
I sent you three P.M. but I doubt that they have not arrived, in my outbox I see that I have two messages sent to you but in brackets like this: Outbox (2).
I admit, I don't know how to use the functions of the site.
Franco
Hi Franco,
The Outbox (2) means that Bas has not logged in to the forum to see that he has private messages waiting for him. He also may not have the notification preference checked in his user profile that will send an email when you have a private message on the forum.
I sent a PM yesterday to a forum member and received an email notifying me of a reply, so the forum software is working correctly (Pompeiisneaks also fixed this a while ago as it was not working then). I hope that helps. Hopefully Bas will stop by soon.
