[ujamerstand]

Nah, I like the contrast that brings to the whole setup once you case it up. Perhaps get some black knobs to suit! Like these. Actually, look at this. *drool*

 

[balderon]

Congrats on your new build! Are the tube completely enclosed or do you need to cut holes in the top? I would say a black front panel would blend nicely with the headphone jack and meters.

 

[tamu]

Thanks guys.
 
The black knobs are very nice indeed.. and the black panel is just porn!
 
listening to the amp now and its very nice airy and controlled. just having some problems with the meters.
 
balderon i have to cut the top. need to get measurements first.. it is creating heaps of heat and i dont thk tubes in the enclosure is a good idea..
 
also im getting a slight buzz in both channels when no music is playing and the volume is at max. its not doing it when its not connected to anythg so i thk its a earthing problem somewhere. any ideas anyone?

 

[adamus]

if nothing it connected then it will buzz. short intput to input ground and then see if it buzzes.

 

[adamus]

Tamu, looking good mate.
 
I would be seriously tempted to get a front panel done by schaeffer  AG, you could make it look superb. pricey though...

 

[balderon]

 
Quote:

Thanks guys.
 
The black knobs are very nice indeed.. and the black panel is just porn!
 
listening to the amp now and its very nice airy and controlled. just having some problems with the meters.
 
balderon i have to cut the top. need to get measurements first.. it is creating heaps of heat and i dont thk tubes in the enclosure is a good idea..
 
also im getting a slight buzz in both channels when no music is playing and the volume is at max. its not doing it when its not connected to anythg so i thk its a earthing problem somewhere. any ideas anyone?

 
I had the same problem with a slight buzz. I ensured the NFB and volume pots had a solid connection to earth ground. Secondly I had separated earth and signal grounds. The NFB and the volume pot was mounted on the faceplate, thus directly to the metal enclosure, and the ground path from the IEC connector (= earth ground) was also connected to the chassis directly... I had a ground loop problem which resulted in undesired noise or hum. The simplest solution was to use a ground loop breaker (which could be implemented one of many ways). I used a 10 ohm 1W wirewound resistor in parallel with a 0.1uF 250VAC capacitor rated for across-the-line use. I connected earth ground to signal ground through this RC network.

 

[tamu]

I will do a proper earthing when Im on the rewiring.. Its a bit messy inside.
 
I need to visit the hardware store for some serrated washers. Ive got the Iec connected to chasis plus the star ground. maybe seperating them should solve it. If not Ill try balderons idea.
 
The front panel by custom order sounds great. maybe Ill get it done in the future.
 
So Ive been listening for couple of hours and now the soundstage is a bit closer. Still very nice though. Im sure another +100 hours and it will get even better.
 
is there a limit for the NFB? How much should I turn it for hd600s? I guess it will be ok to have it at max and play with volume?

 

[adamus]

I use no NFB with senns.
 
Now this is subjective, but i find no NFB = big soundstage + 3d presentation,  Lots of NFB = tight bass, reduced soundstage

 

[tamu]

Himm I might try removing the nfb and see but I have lower impedence hps so its not ideal.. But I agree with the soundstage. When I turn the pot to its max, soundstage is wider but when I turn it to half way it becomes less.
 
Anyway I replaced the input valves with the siemens goldpins that I had and the mushyness is gone. Much much better now. Maybe I should have waited a while before doing so but it was dark and kind of muffled before..
 
So far Im loving the amp.!

 

[dean0]

Iam trying to source some 100uF ASC Oil Motor Run capacitors, only ones I found don't deliver to UK. Any links would be much appreciated.
Thanks

 

[balderon]

 
Quote:

Originally Posted by tamu /img/forum/go_quote.gif
 
I need to visit the hardware store for some serrated washers. Ive got the Iec connected to chasis plus the star ground. maybe seperating them should solve it. If not Ill try balderons idea.
 

Separating earth and chassis ground will probably create even more noise. I eliminated the last of the noise by connecting the frame of my NFB and volume pots to star ground.

 

[tamu]

Himm I will try connecting the nfb pot directly to the ground (its body) with a jumper wire and see if it makes any difference.. When listening there is no noise coming anyway. I think its as adamus says..
 
Thanks for the help guys.
 

 

[dean0]

Still no luck finding ASC 100uf caps to deliver to UK, any chance you guys have a couple lying around?

 

[pabbi1]

Well, I have 1. The ASC is 100uf, 370v. I also have two (not ASC) 370v 45uf, 1 47uf 500v Obblifgato, and 4 Aerovox 1500uf 350v.
 
Any of that help?

 

[dean0]

thanks Pabbi, is the ASC the same as this one http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=380229945477&ssPageName=STRK:MEWAX:IT
those are the ones im after, but they don't ship to UK