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Old 20th November 2004, 04:49 PM   #1
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Default wavlength audio cardinal

this is the 6c45 version, check it out.
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Old 20th November 2004, 07:43 PM   #2
SHiFTY is offline SHiFTY  New Zealand
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Wow looks nice and simple, how does it sound?
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Old 16th March 2005, 08:30 PM   #3
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Default aa

another
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Old 16th March 2005, 09:05 PM   #4
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another
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Old 16th March 2005, 10:13 PM   #5
Previously: Kuei Yang Wang
 
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Konnichiwa,

A little decoding around the 300B....

Heaters are DC without much ado, bridge rectifier, and what looks like Nichicon Muse Capacitor15,000uF, plus the usual Humbuck Pot & Shunted across resistors.

Cathode combo 1K/25W Metalclad Power Resistor with 39uF Solen Cap as bypass.

The Socket is Yamamoto PTFE and there is a Gridstopper (maybe 1K or less?) and a Magnequest Gridchoke, probably custom Spec.

Coupling Capacitor is unrecognisable, but there are many possible favours. Output Transformer is Magnequest, probably a custorm Version of the FS-030.

The main Powersupply has a modest value Film capacitor after the rectifier valve (I'd estimate on the size maybe 10 - 22uF), followed by the choke (lower righthand side) maybe around 10H, could be 15-20H and followed by a big Black Gate 2-Section PSU Capacitor (probably 100u+100u/500V WKZ), first section for 300B PSU, the second for the Input Stage.

Amplifier starground is at the BG's negative terminal, but it also seems the Amplifier Plate is used as Groundplane with several components simply returned via this.

The 12K1 Mill Power wirewound visible is the decoupling for the 6S45 PSU and the second 12K1 Mills is the 6S45 Anode load.

There is also the 6S45 cathode combo hidden there, looks like "L Cancelling Pair" Black Gate NX-HiQ and on the RCA Jack is the Gridleak resistor and the Gridstopper.

Values cannot be made out but are easy enough to guesstimate, 47K Gridleak, 1K Gridstopper and between 200-300 Ohm Cathode R (I'd adjust for 170 - 200V on the 6S45 Anode).

In other words like this:

Click the image to open in full size.

Fair bit of expensive componentry in there, otherwise straight forward and sensible design, very much in line with my prejudices (except the BG's, that is).

Sayonara
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Old 17th March 2005, 07:03 AM   #6
Ejam is offline Ejam  Australia
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Default Capacitor for the Cardinal

Thorsten

The cap looks very similar to a Handmade silver foil and oil, I used some years ago. Possible that Gordon had it made by the same manufacturer to his specs. Gordon always refers to using Audionote copper foil coupling caps in his DIY designs. Could this be an Audionote silver foil cap?

Regards

Ejam
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Old 17th March 2005, 08:47 AM   #7
Previously: Kuei Yang Wang
 
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Default Re: Capacitor for the Cardinal

Konnichiwa,

Quote:
Originally posted by Ejam
Could this be an Audionote silver foil cap?
As I regulary use these - I don't think so, the AN's are physically bigger.

Sayonara
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Old 17th March 2005, 11:00 AM   #8
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Looks like Gordon's used the diy hifi supply lady day for inspiration eh Thorsten? he's getting ideas from you
no lf peaking tuning on the grid choke.
hell, he'll probably do a weco 91 next!!
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Old 17th March 2005, 11:14 AM   #9
Previously: Kuei Yang Wang
 
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Konnichiwa,

Quote:
Originally posted by lt cdr data
Looks like Gordon's used the diy hifi supply lady day for inspiration eh Thorsten?
Nah, we just hang out in the same esotheric on-line circles and start picking up similar ideas. The Gridchoke & Gigh GM triode in front is something I picked up from him on the Joenet, so it's lil ole me thieving from GR not the other way....

Sayonara
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Old 17th March 2005, 08:36 PM   #10
GSI is offline GSI  Europe
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I think coupling cap is possibly Hovland.
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