Quanghao is on vacation for 2 weeks. Maybe he will answer your question later, brother
He should do.. I just ordered some a few days ago.. Unfortunately they wont be send out for another 2 weeks tho..
Found a minor error in silk screen on the I/V board: J3 & J4 L-IN/R-IN is mixed, should be other way. "From IV" L goes to J4 R-IN and vise versa. Don't know what to do with those J3 & J4 though. 🙂
What kind of jumper can be added to JUMP in DAC board? Tried a normal pinheader, but pins don't fit.
What kind of jumper can be added to JUMP in DAC board? Tried a normal pinheader, but pins don't fit.
In the board I/V is not wrong.
The Jumper You just connect the foot 1 to 2 and You do welding them,( not put Jump on the board).
there is a solution for high frequency noise, so I leave it as an option for users who want to choke instead of resistance, but I still recommend using R instead of choke. Thus the effect of tl431 to work.
Attachments
I talked to a guy in Germany cause the transformer. He is building perfect transformers for valve-amps.
The Anode-current is 30-36 mA per valve, ís that right ?
We can get a very good transformer for "payable money" which delivers
3 x 12v / 1 x 9V and 1 x 250V.
Hope to can tell you more next week.
regards Michael
The Anode-current is 30-36 mA per valve, ís that right ?
We can get a very good transformer for "payable money" which delivers
3 x 12v / 1 x 9V and 1 x 250V.
Hope to can tell you more next week.
regards Michael
I'm very interested, if he will be able to post. Will it be multiple input windings or a single winding?
Any input with this? How about C26&C27 (10nF) in the same board/filter (DAC output)?
sugden, For C26, C27, C28 and C29 (10nF) MKP/FKP are prefered.
The decoupling/snubbers capacitors are less critical. MKC/MKP/MKT capacitors are all fine for the purpose, as long as they fit the board.
The decoupling/snubbers capacitors are less critical. MKC/MKP/MKT capacitors are all fine for the purpose, as long as they fit the board.
About Wima MKS, they sound bad, oops sorry, I don't like them. Sound too dry, sharp.
For input cap I ordered Hi End GAD-Viva Zinc MKP 0.01uf Capacitor,630VDC
Hi End GAD-Viva Zinc MKP 0.01uf Capacitor,630VDC - eBay Parts Accessories, Amplifiers, Home Audio, Electronics. (end time 05-Mar-10 18:43:01 AEDST)
For the filter I selected Vishay Roederstain MKP1837 0.01uF available from Farnell or RS
Also I use MKP1837 0.1uF as bypass on tube cathode. They just fit in by offsetting the electrolytic a little bit.
For C3, C6, C8, C11 Tube stage I will try between Oscon and Elna Silmic II.
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The only one I would use is the large one on C1,C2,C3,C4 on high voltage PSU. You need four of them. The rest in particular the red one I would not consider.
The Vishay Roederstain MKP1837 is the beloved one. Use it on Dac filter, Cathode bypass and around +5 , -5 the Analog DC input of the DAC.
Vishay BC MKS 0.1uF where the MKP won't fit with criteria.
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I check my local Farnell & RS website, they selling Vishay Roederstain MKP1837 0.1uF & 0.01uF very expensive. I will find other source. Can i use Sprague Black Beauty 0.01uF/600V as input cap. at C28 & C29 on DAC-end board? Thanks
On RS components you can buy a packet of 10 for $1.5 each. Farnell would be $80 or more
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