My caps of PS run hot, though the sound is still good. I have checked my work and could not see anything strange. Where can I find a schematics for PS part of...
Larry
larry@...
Sep 1, 2002 9:20 am
1508
My large PS caps run hot, always have, hotter than the tube. If you used the ones I mentioned, they're rated at 105 or 3 at 85 deg C. If they were anywhere...
Thanks for that. I used very close Panasonic your recommended: 3 x NHG 2200uF@25V , 4 x FC 560uF@25V and 4x FC at 220uF@63V. All of them are hot, in particular...
Larry
larry@...
Sep 1, 2002 11:07 am
1510
Yeah, you might have some issue. I don't know what to suggest except measure voltages. Leave the top off and touch each component, see what's really hot. My...
The main cause of capacitor heating is excessive ripple current. In PSUs this is usually caused by underated transformers. Is your mains transformer also...
Good point Brian, and also, some of the caps are receiving the *half wave rectified* AC input...lotsa ripple there. And voltage doublers/multipliers do depend...
My mains transformer is 30VA and runs cool. Thanks for explanation. Can anyone used Panasonic caps in PS confirm that all caps are when tube is in? This can be...
Larry
larry@...
Sep 1, 2002 10:15 pm
1514
I will have a new stock unit in about a week, and can compare with a modded unit. I can open my modded unit a bit later on tonight and touch the parts again,...
I have finished the Jensen transformer mod and am trying to wire my Canare 75ohm RCA to the digital board. I have the center conductor wired to the chassis...
Mine is stock and runs warm. Stancor PS. Case is very warm over it's entire surface but slightly more over tube and back towards power connector. The center...
Hi, Thank you all for your response. I could not sleep with the 'hot' caps last night. (I powered it off before I went to bed) Now I can leave it on tonight,...
Larry
larry@...
Sep 2, 2002 9:29 am
1518
Hi, Try grounding the chassis or maybe connecting the rca common to chassis through a .1 uf ceramic. Let us know how it goes. Thanks...
Hi all I am new to this group-so Hi! I am about to buy a DIO to play with, so I have not had experience yet of the joys(?) of modding this baby. However, I...
Hi Steve, I have a tube amp (Conrad Johnson) and shorting the capacitors caused a noise when adjusting the volume control but the sound was much better - more...
Is it possible to use Black Gate caps on the main board if one is using only the D/A circuits? I understand that Black Gates are too big to use if both the...
It ends up, my digital coax wiring was fine... but, guess what happens when you do the 1-pin offset of the LT1086 in the WRONG direction? It worked flawlessly...
Assuming you are doing the ouput transformer mod... there is plenty of room for Black Gates if you take out all or some of the unused diodes, caps, regulators,...
I think Charles meant keeping the opamp in the output stage, but removing all ADC components, including power supply caps. I also wonder the same thing.. I...
Look at Chris's photos. the one that says "neki dio" , I had the same question and he pointed out that this picture is DI/O with only D/A components left in....
I am looking at nekid DIO-top4H picture from Chris's photos.. and does that amp work as it is (with the digital board attached, of course). Can all of those...
Thanks, but I did a search on the page and it didn't turn up a "neki dio" photo. Also, just to be clear, sil0nt is correct, I want to leave the op-amp in the...
... According to the schematics, all parts removed CAN be removed if you only want the D/A section. I never actually tested the nekid board using the opamps...
Chris
ck42@...
Sep 5, 2002 4:16 pm
1530
Chris, I am looking at the photo. Did you leave out C9? If you did, it seems like it is a bypass for CR4 and CR5 which you have left in. I have not looked...
Just looked at the schematic and yes, C9 should be left in. I can't tell from my pix WHERE C9 is located and I've already buttoned up my DI/O so I'm not sure...
Chris
ck42@...
Sep 5, 2002 6:08 pm
1532
I will look tonight and will post! mine is closed but I have to open it anyway for the new Blackgates in the output. Regards Amir ... tell ... so I'm...
you were correct! the C9 is replaced. You could not tell form the picture if it was C8 or C9. my DI/O works fine with the op-amp and I did leave out the...
I was planning on just running a single wire from the PCB to the center pin and from the PCB to the ground tab for each jack at JK3 and JK4. Is there a better...
... side) ... Well, it appears I screwed it up. The DIO lights up but will not synch, and soundwise I do not even get that "out of synch hissss" when playing....
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