Kingsley - Minstrel  [traced]

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Re: Kingsley - Minstrel

Postby Frabbio » 20 Sep 2011, 08:38

Will something like this resolve issues? I've modified the routing of the heater supplies and added a fuse holder on board.

Image
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Re: Kingsley - Minstrel

Postby mmolteratx » 21 Sep 2011, 06:09

That looks better. Basically you just need them to be parallel for the majority of the run to cancel as much of the radiating magnetic field as possible. Really you could ignore the 8.1 resistor and halve the current and decrease the field strength as a result.
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Re: Kingsley - Minstrel

Postby jwpartain1 » 21 Sep 2011, 13:23

What kind of supply is this little guy running off of?
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Re: Kingsley - Minstrel

Postby mmolteratx » 21 Sep 2011, 18:53

12VAC. Then the transformer steps it up to around 240V.

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Re: Kingsley - Minstrel

Postby Frabbio » 21 Sep 2011, 19:32

Perfect. Can you confirm the transformer is
Primary:
2x115 volt wired in series
Secondary
2x7volt wired in parallel?
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Re: Kingsley - Minstrel

Postby mmolteratx » 21 Sep 2011, 20:34

This is the transformer used.

http://part.aboutsemi.com/amveco/62010.html

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Re: Kingsley - Minstrel

Postby Frabbio » 21 Sep 2011, 20:45

Yeah, i see that on the schematic, i'd like to know how it is wired, especially the secondary (it's in parallel (7volt) or in series (14v)?)
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Re: Kingsley - Minstrel

Postby Frabbio » 21 Sep 2011, 22:41

Ok, i had confirm of what i said before by looking at the gutshot, the primaries are wired in series, the secondaries are wired in parallel, applying 12 volt on a 7 volt transformer gives higher anodic tension.
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Re: Kingsley - Minstrel

Postby Liquids » 23 Sep 2011, 17:22

I've been using a chassis not a stomp box tube pedal I'm working on from the ground up (and will be able to switch it remotely via a small box on my pedal board from wherever).

I don't like that the Kingsley products use a passive & primal 3-band EQ, which is invariably mid-scooped and then will go into a typically mid-scooped amp = harsh sound, from my experiences.

A baxandall can at least be set flat and has much better control over restoring bass lost in the gain stages trying to keep things from being mushy.

Those in the US - Allied has multiple very cheap chassis-mount transformers that would be perfect for tube preamps if you arent' trying to squeeze everything into a stompbox. If you are there are still choices albeit restricted in voltage etc...the classis fender standalone reverb unit and champ power transformers should be more than adequate as well if they meet your voltage requirements...tubesandmore.com and allen amplification also sell tube preamp power transformers.

I'm liking mine alot, and avoiding the lame step-down wallwart for 12v heaters---> step up transformer for plates by simply wiring a power cord to a regular transformer is nice.

Heck, EHX used mains power and a internal transformer for quite a few of their classic pedals. And I suspect that if one could get a hold of one of their classic over-sized flimsy enclosures it would be plenty of room for a transformer, 2 preamp tubes, turretboard and stompswitch if you MUST have your preamp on the pedalboard.
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Re: Kingsley - Minstrel

Postby jwpartain1 » 27 Sep 2011, 13:25

Frabbio could you post a file with just the traces? I'm interested in etching this one :D
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Re: Kingsley - Minstrel

Postby Frabbio » 27 Sep 2011, 17:03

Here it is :)
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Re: Kingsley - Minstrel

Postby Intripped » 21 Nov 2011, 17:27

hey Frabbio, any news?
did you build it?

i'm considering building this preamp as well, i'd like to have a confirm: does it work\sound good?
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Re: Kingsley - Minstrel

Postby mmolteratx » 22 Nov 2011, 00:25

Liquids wrote:I've been using a chassis not a stomp box tube pedal I'm working on from the ground up (and will be able to switch it remotely via a small box on my pedal board from wherever).

I don't like that the Kingsley products use a passive & primal 3-band EQ, which is invariably mid-scooped and then will go into a typically mid-scooped amp = harsh sound, from my experiences.

A baxandall can at least be set flat and has much better control over restoring bass lost in the gain stages trying to keep things from being mushy.

Those in the US - Allied has multiple very cheap chassis-mount transformers that would be perfect for tube preamps if you arent' trying to squeeze everything into a stompbox. If you are there are still choices albeit restricted in voltage etc...the classis fender standalone reverb unit and champ power transformers should be more than adequate as well if they meet your voltage requirements...tubesandmore.com and allen amplification also sell tube preamp power transformers.

I'm liking mine alot, and avoiding the lame step-down wallwart for 12v heaters---> step up transformer for plates by simply wiring a power cord to a regular transformer is nice.

Heck, EHX used mains power and a internal transformer for quite a few of their classic pedals. And I suspect that if one could get a hold of one of their classic over-sized flimsy enclosures it would be plenty of room for a transformer, 2 preamp tubes, turretboard and stompswitch if you MUST have your preamp on the pedalboard.


Mine sounded great but I ran it into a THD with a James tone stack.
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Re: Kingsley - Minstrel

Postby Intripped » 06 Dec 2011, 22:40

a couple of questions :hmmm:

is C13 correctly oriented in the schematic? and why C13 and C14 have different values?

has anybody measured the actual voltage on C15 and\or C16 in the original pedal?

thanks
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Re: Kingsley - Minstrel

Postby johngovan1234 » 20 Aug 2018, 16:24

Can someone reuploaded the schem and board layout. Thank you.

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