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 21 Sep 2019, 06:56

All times are UTC - 6 hours [ DST ]




Post new topic Reply to topic  [ 116 posts ]  Go to page Previous  1, 2, 3, 4, 5 ... 12  Next
Author Message
PostPosted: 28 Nov 2016, 21:51 
Offline
Project Author
User avatar

Joined: 06 Jun 2008, 18:23
Posts: 5135
Location: Australia
The first of the lacquer coats. Dust will always be a problem when I paint outdoors. Worst thing is I do it under a tree. Also runs proved an issue. Thank God I'm better with a soldering iron.
Attachment:
PB293547 (800x600).jpg


This post has a file attachment. Please login or register to access it. Only Registered Members may view attached files.


_________________
Projects:"retro2308" - chip based headphone amp | ”Calibre 834” - tube phono MM preamp | ”najah” - Raw 180W Tripath Class D power amp | "Icon" - Shuguang CV-181Z preamp


Top
 Profile  
 
PostPosted: 02 Dec 2016, 20:31 
Offline
Project Author
User avatar

Joined: 06 Jun 2008, 18:23
Posts: 5135
Location: Australia
I sanded after the first polyurethane coat. There was some prickling of the timber and then applied a second coat. I didn't re-sand but have now added a third coat of lacquer.

I'm not sure if the parts I want to use will fit in the box but I did do a rough mockup and initially it looks OK. Also I'm not sure how well the top of the box will drill seeing I need some big holes. I use a stepper drill and on other light timber this has worked OK in the past.

I have purchased a second box which I will give a light sand and beeswax. Then I will see how parts go and will this sacrificial box drill. Images to follow.

_________________
Projects:"retro2308" - chip based headphone amp | ”Calibre 834” - tube phono MM preamp | ”najah” - Raw 180W Tripath Class D power amp | "Icon" - Shuguang CV-181Z preamp


Top
 Profile  
 
PostPosted: 02 Dec 2016, 22:22 
Offline
Project Author
User avatar

Joined: 06 Jun 2008, 18:23
Posts: 5135
Location: Australia
Here are some images of the new box and one after a light sand and beeswax. Good old Oz beeswax.
Attachment:
PC033548 (800x600).jpg
Attachment:
PC033550 (800x600).jpg


This post has a file attachment. Please login or register to access it. Only Registered Members may view attached files.


_________________
Projects:"retro2308" - chip based headphone amp | ”Calibre 834” - tube phono MM preamp | ”najah” - Raw 180W Tripath Class D power amp | "Icon" - Shuguang CV-181Z preamp


Top
 Profile  
 
PostPosted: 07 Dec 2016, 16:51 
Offline

Joined: 15 Nov 2013, 10:16
Posts: 234
Location: MB, Canada
I suppose it wouldn't provide enough gain for your power stage, but if I was going metal tubes, I've always wanted to do something with those fancy red RCA 5693 tubes.. Same as the 6SJ7 I believe. Datasheet specifies amplification factor of 19 in triode mode, the operating characteristics look pretty good from what I can tell from the datasheet.


This post has a file attachment. Please login or register to access it. Only Registered Members may view attached files.



Top
 Profile  
 
PostPosted: 07 Dec 2016, 18:52 
Offline
Project Author
User avatar

Joined: 06 Jun 2008, 18:23
Posts: 5135
Location: Australia
My black metal can 6L6 are only a high temperature spray paint can away from being red. Not a bad idea though.

_________________
Projects:"retro2308" - chip based headphone amp | ”Calibre 834” - tube phono MM preamp | ”najah” - Raw 180W Tripath Class D power amp | "Icon" - Shuguang CV-181Z preamp


Top
 Profile  
 
PostPosted: 07 Dec 2016, 21:14 
Offline

Joined: 05 Jun 2012, 13:10
Posts: 196
Location: Darboy, WI, USA
Mark, did I miss the schematic?

_________________
Thanks,
Ross in Wisconsin


Top
 Profile  
 
PostPosted: 09 Dec 2016, 20:19 
Offline
Project Author
User avatar

Joined: 06 Jun 2008, 18:23
Posts: 5135
Location: Australia
RossD wrote:
Mark, did I miss the schematic?

Try this: viewtopic.php?p=46470#p46470

_________________
Projects:"retro2308" - chip based headphone amp | ”Calibre 834” - tube phono MM preamp | ”najah” - Raw 180W Tripath Class D power amp | "Icon" - Shuguang CV-181Z preamp


Top
 Profile  
 
PostPosted: 10 Dec 2016, 18:50 
Offline
Project Author
User avatar

Joined: 06 Jun 2008, 18:23
Posts: 5135
Location: Australia
An image of the two boxes for the amp. I am hoping to try my drilling techniques with the blond box before drilling big holes in the stained and finished box. But as you can see the two timbers are quite different. Drilling one may not predict what will happen when you drill the other. But ill give it a fare crack.

Attachment:
PC113556 (800x600).jpg


This post has a file attachment. Please login or register to access it. Only Registered Members may view attached files.


_________________
Projects:"retro2308" - chip based headphone amp | ”Calibre 834” - tube phono MM preamp | ”najah” - Raw 180W Tripath Class D power amp | "Icon" - Shuguang CV-181Z preamp


Top
 Profile  
 
PostPosted: 10 Dec 2016, 20:42 
Offline
Project Author
User avatar

Joined: 06 Jun 2008, 18:23
Posts: 5135
Location: Australia
A possible internal layout. Filament tranni into a step up for the HT.
Attachment:
WP_20161211_12_16_19_Pro_LI (800x449).jpg


This post has a file attachment. Please login or register to access it. Only Registered Members may view attached files.


_________________
Projects:"retro2308" - chip based headphone amp | ”Calibre 834” - tube phono MM preamp | ”najah” - Raw 180W Tripath Class D power amp | "Icon" - Shuguang CV-181Z preamp


Top
 Profile  
 
PostPosted: 26 Dec 2016, 19:43 
Offline
Project Author
User avatar

Joined: 06 Jun 2008, 18:23
Posts: 5135
Location: Australia
This project has stalled a bit. I'm was managing three projects. One was completed a short time back, the LM833 phono preamp, one half finished - a re-hack of an early chip amp, and one other completely stalled but dividing my attention.

The sacrificial wood box for the 6L6 amp was lightly sanded and beeswaxed. The other day I had to move it and realised it felt furry. The beeswax had caused the prepped timbre to prickle. I cant use sand paper as it will just clog with the beeswax so I used a rough metal pot scrubber. A very light wiz over with the scrubber removed the prickle and then I applied another beeswax layer.

Should be fine now.

_________________
Projects:"retro2308" - chip based headphone amp | ”Calibre 834” - tube phono MM preamp | ”najah” - Raw 180W Tripath Class D power amp | "Icon" - Shuguang CV-181Z preamp


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 116 posts ]  Go to page Previous  1, 2, 3, 4, 5 ... 12  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