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Novar Spud :: A 0 sweep tube Spud with PCB
Novar Spud :: A 0 sweep tube Spud with PCB
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Old 18th July 2018, 05:29 PM   #171
nycavsr2000 is online now nycavsr2000  United States
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Novar Spud :: A 0 sweep tube Spud with PCB
NS,

I quote from Tomís website:

Quote:
The toroidal transformers by Antek Inc. are very hard to beat when it comes to good performance for little money. If youíre planning to use the 6GF7A, I recommend getting the AS-1T200 for a rectified B+ of 250 V. If youíre using the 6KY8 or 6LR8, I recommend the AS-1T250 for a 300 V B+. The Edcor XPWR050 is a strong candidate as well and would result in a 300 V B+.
Best,
Anand
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Old 18th July 2018, 05:44 PM   #172
tomchr is offline tomchr  Canada
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Thanks Anand!

Note that the XPWR050 is available with international primary (120/240 V) for an additional $3. That's a nice option for those overseas.

Tom
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Modulus-686: 240W/8Ω @ <0.00025% THD. Modulus-86: 40W/8Ω @ 0.000054% THD. DG300B & Other Tube Circuits.
Neurochrome : : Audio - www.neurochrome.com - Engineering : : Done : : Right
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Old 18th July 2018, 06:05 PM   #173
Natural Sound is offline Natural Sound  United States
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Quote:
Originally Posted by nycavsr2000 View Post
NS,

I quote from Tomís website:



Best,
Anand
Thanks I missed that. I was looking at the design documentation PDF and there is no mention of it there.


The bad news is that the XPWR050 has an EIGHT week lead time. Oh well, guess I'll get my order placed and work on something else.
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Old 18th July 2018, 06:26 PM   #174
nycavsr2000 is online now nycavsr2000  United States
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Novar Spud :: A 0 sweep tube Spud with PCB
NS,

Mind you Edcorís estimate is their worst case scenario. I ordered a pair of autoformers from them recently and despite the Internet quote of 6 weeks, the product arrived at my doorstep in 10 days.

So a phone call may help to clarify.

That being said I am biased towards transformer designs that allow for an electrostatic shield as well a magnetic band or steel housing which the Antek most certainly offers.

And if you want to go all out, then order a custom power toroid from ďToroidyĒ in Poland, with all the bells and whistles your diy heart desires, just pony up the $$$ .

Best,
Anand.
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Old 18th July 2018, 07:17 PM   #175
tomchr is offline tomchr  Canada
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I've only ordered once from Edcor, so my experience may not be representative. I think they quoted 6-8 week lead time (even over the phone). They shipped in two weeks. They seem to be an under-promise, over-deliver type place. Their CXSE25-5K OPT is a nice OPT. I just wish it had 4 Ω and 8 Ω taps.

You can also toss John an email at Antek. Maybe he can give you an update on the lead time.

Tom
__________________
Modulus-686: 240W/8Ω @ <0.00025% THD. Modulus-86: 40W/8Ω @ 0.000054% THD. DG300B & Other Tube Circuits.
Neurochrome : : Audio - www.neurochrome.com - Engineering : : Done : : Right
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Old 18th July 2018, 08:22 PM   #176
nycavsr2000 is online now nycavsr2000  United States
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Novar Spud :: A 0 sweep tube Spud with PCB
Indeed! I have only good things to say about Edcor! Their level of communication is excellent...only topped by a few like Neurochrome etc

Best,
Anand
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Old 18th July 2018, 08:57 PM   #177
Natural Sound is offline Natural Sound  United States
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Quote:
Originally Posted by tomchr View Post
You can also toss John an email at Antek. Maybe he can give you an update on the lead time.

Tom

It was John that told me 6 weeks.
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Old 19th July 2018, 06:19 PM   #178
kengler13 is offline kengler13  United States
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I finally have gotten around to putting my Novar Spud together.

Unfortunately I have a 60hz hum that I can't seem to get rid of. Hum does not change with volume adjustment. Removed inputs and binding posts from chassis with no difference. Tried multiple grounding locations with no change. If I remove source and short inputs there is no hum. Unsure what else to do at this point. 3rd photo of layout is before I finished wiring the outputs, I can upload a current photo when I get home, but the -'s are connected and ground to the pcb as per the schematic.
Attached Images
File Type: jpg side.jpg (63.4 KB, 65 views)
File Type: jpg Front.jpg (46.2 KB, 67 views)
File Type: jpg layout.jpg (88.7 KB, 67 views)
File Type: jpg 2018-07-19.jpg (55.5 KB, 66 views)
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Old 20th July 2018, 04:20 AM   #179
tomchr is offline tomchr  Canada
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If the hum goes away when you short the inputs, the hum does not come from the amp.

I suspect you have a ground loop between the source and the amp. You can break that with a line transformer. You can also try a ground lifting circuit. I'm normally not a fan of those, but they can at least help you debug the issue.

If you have a 2-pin IEC cable (i.e. one with the ground missing) or one of the 3-pin to 2-pin adapters (ground cheaters) you can try that first. You can find the adapters at your local hardware store. If this removes the hum, we can work out a more permanent solution.

I do like that you've used grommets where the wires go through the chassis. Nice work.

Tom
__________________
Modulus-686: 240W/8Ω @ <0.00025% THD. Modulus-86: 40W/8Ω @ 0.000054% THD. DG300B & Other Tube Circuits.
Neurochrome : : Audio - www.neurochrome.com - Engineering : : Done : : Right

Last edited by tomchr; 20th July 2018 at 04:27 AM.
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