DIY Audio Projects Forum
 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

DIY Audio Projects Forum

Welcome to the DIY Audio Projects Message Forum. Use these forums to discuss Hi-Fi audio and to share your DIY Audio Projects. Registration is free and required to post messages and view the file attachments. Registration will only take a minute and registered users do not see any advertisements. After you have completed the online registration process, check your email (including spam/junk folder) for the verification email to activate your account. New members are under moderation - so your posts will not be visible until approved by a moderator. See the Read Me 1st, Forum RULES and Forum FAQ to get started on the forum.

It is currently 15 Dec 2019, 07:52

All times are UTC - 6 hours [ DST ]




Post new topic Reply to topic  [ 24 posts ]  Go to page Previous  1, 2, 3  Next
Author Message
PostPosted: 27 Oct 2009, 18:23 
Offline
Project Author
User avatar

Joined: 14 Oct 2008, 17:35
Posts: 901
Location: Dartmouth, Nova Scotia
Try a bigger filter cap like 1000uF, but it should not make that much of a difference, it is most likely an annoying ground loop that I end up with in just about every project I make because it is hard to make all of the ground wires go to one ground post, so when I touch something like a pot contact or the outside of an RCA jack the noise would either get worse or better.

_________________
My Mini 12AU7 Tube Preamp, Pioneer SX-D7000, JVC XL-V221BK, JBL L80T, DCM TF700


Top
 Profile  
 
PostPosted: 28 Oct 2009, 11:25 
Offline

Joined: 27 Aug 2009, 15:19
Posts: 243
Location: Sweden
Ohyeah ! our old common friend Mr Groundloop ;)
Almost forgot all about him by now.
He just got to be related to Mr Murphy somehow :P
i give'it a shot to connect power ground ( - ) to line out ground and see or (hear) what happen's,

Regards,
Kjell.


Top
 Profile  
 
PostPosted: 30 Oct 2009, 10:56 
Offline

Joined: 27 Aug 2009, 15:19
Posts: 243
Location: Sweden
Problem solved !
on L78xx series is tab ground so a small wire from - ( neg ) side to ground took care of that and
now it sounds even after 6 hours just :up:

Regards,
Kjell.


Top
 Profile  
 
PostPosted: 30 Oct 2009, 16:14 
Offline
User avatar

Joined: 08 Aug 2009, 03:11
Posts: 2229
Location: Chilliwack, BC
Great! :up:

I think word on this thing is getting around. I've been sniped at every auction for one :x

If you look at the sales history, they've been steadily increasing in final bid price.

Cheers!

_________________
-= Gregg =-
* Ratings are for transistors - tubes have guidelines*
Home: GeeK ZonE
Work: Classic Valve Design


Top
 Profile  
 
PostPosted: 30 Oct 2009, 16:45 
Offline

Joined: 27 Aug 2009, 15:19
Posts: 243
Location: Sweden
Hi Geek,
Yeah i noticed that too and for once i plead not guilty :shock:
i think i got mine for close to 12 buck's and some went for almost 20 i belive,
kind of strange with all those millions of items on e-bay and this guy is the only one who have them
could be that he makes those and if not it should be a manufacture of those and maybe we should
track this builder down and try to buy a s**t load of them :idea:
I know for sure that i could easy sell 30 of them.
I also looking into the IC itself that is a Mp3 decoder and a piece of pcb and some sockets for usb
and a memory card and build my own unit maybe ;)

Regards,
Kjell.


Top
 Profile  
 
PostPosted: 30 Oct 2009, 21:01 
Offline
User avatar

Joined: 08 Aug 2009, 03:11
Posts: 2229
Location: Chilliwack, BC
I'm useless at chip programming, otherwise adding a display to this would be a super advantage.

Cheers!

_________________
-= Gregg =-
* Ratings are for transistors - tubes have guidelines*
Home: GeeK ZonE
Work: Classic Valve Design


Top
 Profile  
 
PostPosted: 30 Oct 2009, 23:14 
Offline
User avatar

Joined: 08 Aug 2009, 03:11
Posts: 2229
Location: Chilliwack, BC
Yay! I finally won one of the darn things! :present: :D :up:

_________________
-= Gregg =-
* Ratings are for transistors - tubes have guidelines*
Home: GeeK ZonE
Work: Classic Valve Design


Top
 Profile  
 
PostPosted: 31 Oct 2009, 01:39 
Offline

Joined: 27 Aug 2009, 15:19
Posts: 243
Location: Sweden
Congratulation :sing:
I'm since a few days looking around for a "drop in" display and when it's a output for'it so why not, would be pretty cool huh !


Top
 Profile  
 
PostPosted: 31 Oct 2009, 04:10 
Offline
User avatar

Joined: 08 Aug 2009, 03:11
Posts: 2229
Location: Chilliwack, BC
Thanks! :thumbsup:

If you find a display, please let us know :king:

Cheers!

_________________
-= Gregg =-
* Ratings are for transistors - tubes have guidelines*
Home: GeeK ZonE
Work: Classic Valve Design


Top
 Profile  
 
PostPosted: 23 Nov 2009, 22:10 
Offline
User avatar

Joined: 08 Aug 2009, 03:11
Posts: 2229
Location: Chilliwack, BC
I got mine today, but the resonator was smashed :bawling:

The unit otherwise is physically OK and the bubble wrap and envelope shows no sign of damage, so it couldn't have happened in shipping (likely he got a lemon and didn't notice it).

Hopefully he can arrange a replacement.

Cheers!

_________________
-= Gregg =-
* Ratings are for transistors - tubes have guidelines*
Home: GeeK ZonE
Work: Classic Valve Design


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 24 posts ]  Go to page Previous  1, 2, 3  Next

All times are UTC - 6 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 4 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
DIY Tube Projects :: DIY Tube Amp Kits :: DIY Speaker Projects :: DIY Solid State Projects :: DIY IC / Op-amp Projects :: DIY Phono Projects :: DIY Cable Projects :: Hi-Fi Audio Schematics
© diyAudioProjects.com - Terms of Service - Privacy Policy