DIY Audio Projects Forum
 NEW  Bruce Heran outlines the details and construction of his simple DIY 6DJ8 (ECC88) Tube Hi-Fi Headphone Amplifier Project.

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 25 Jul 2014, 10:56

All times are UTC - 6 hours [ DST ]




Post new topic Reply to topic  [ 154 posts ]  Go to page Previous  1 ... 7, 8, 9, 10, 11, 12, 13 ... 16  Next
Author Message
PostPosted: 21 Feb 2012, 21:58 
Offline
Project Author
User avatar

Joined: 04 Jun 2008, 20:59
Posts: 2329
Location: Arizona, USA
So that is what that big thing is for. And to think I just thought it was for turning on the dash lights. :D

All this funnyness brings up a good point. If you don't have a tube tester, you are at the mercy of the salespeople selling the tubes. I routinely test all new tubes. When I find some that don't measure up, I get on the phone and ask for a RMA. Tube testers are also valuable for matching tubes. I have found that even matched pairs are often not so well matched. Since I use a lot of double triodes it allows for section to section matching too, often overlooked in matched pairs. Or if done at all an extra cost item.

Good listening
Bruce

_________________
Some of my DIY Tube Amplifier Projects:


Top
 Profile  
 
PostPosted: 27 Feb 2012, 23:19 
Offline
Project Author
User avatar

Joined: 06 Jun 2008, 18:23
Posts: 3728
Location: Australia
The layout. Two chassis - PS 180 X 350 and Amp 300 X 350mm. Don ( a DIY buddy) is going to make the bases once the top plates are cut. Al will be 2mm think. Yes that is a motor start on the PS but it will be one of a number of filter/storage caps.

Don is also making a 807- Matt's schematic.
Attachment:
Layout_I.jpg
Attachment:
Layout_II.jpg
Attachment:
LayoutAmp_I.jpg


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


_________________
Projects: "Parley" - Tube preamp with Pass B1 buffer | "Sanguine" - 6AS7 Headphone amp with Sophia Mesh Plate 274B rec. tube | "Black Lace" - all Ozzie tube 6V6 Power amp - old school
Website: [ retro-thermionic ]


Top
 Profile  
 
PostPosted: 28 Feb 2012, 07:55 
Offline
Project Author
User avatar

Joined: 06 Jun 2008, 18:23
Posts: 3728
Location: Australia
When I built the Silver Dragon I had a local metal merchant provide and cut the plates for me in 2mm Al. When I picked up the plates I got all the left over Al. From the leftover Al I can have cut the two top and bottom plates for the amp and PS. I have been quoted about $20 for the cut. This has saved me some money. Tomorrow I'm to have the plates cut for me then off to have the bases made to fit the plate.

_________________
Projects: "Parley" - Tube preamp with Pass B1 buffer | "Sanguine" - 6AS7 Headphone amp with Sophia Mesh Plate 274B rec. tube | "Black Lace" - all Ozzie tube 6V6 Power amp - old school
Website: [ retro-thermionic ]


Top
 Profile  
 
PostPosted: 28 Feb 2012, 22:52 
Offline
Project Author
User avatar

Joined: 06 Jun 2008, 18:23
Posts: 3728
Location: Australia
There are some nice people in the world. Took the plate out to Capal (Al suppliers and cutters) and they cut it for free. Nice guys. While there I found a $10 piece of scrap 2mm (about 300mm X 300mm) plate which Don is also making a base for (amp to be decided).

Don now has the plate and has started the bases. It may take a week though. In the meantime I'll collect hardware and passive parts. It's all go.

_________________
Projects: "Parley" - Tube preamp with Pass B1 buffer | "Sanguine" - 6AS7 Headphone amp with Sophia Mesh Plate 274B rec. tube | "Black Lace" - all Ozzie tube 6V6 Power amp - old school
Website: [ retro-thermionic ]


Top
 Profile  
 
PostPosted: 28 Feb 2012, 23:27 
Offline
Editor
User avatar

Joined: 28 May 2008, 21:53
Posts: 4245
Location: Winnipeg, CANADA
Hi Mark, on the layout, don't get the filter cap too close to the rectifier tube. Too much heat reduces the life of the capacitor. Looks like that amp is going to have some good weight to it.

Cheers

_________________
[ DIY Mains AC Power Cable Cord ] - [ K-12 Tube Amp Kit ] - [ Tang Band D4-1 Horn Speaker Kit ] - [ Monoblock Push-Pull KT88 Tube Amp Kit ]


Top
 Profile  
 
PostPosted: 28 Feb 2012, 23:46 
Offline
Project Author
User avatar

Joined: 06 Jun 2008, 18:23
Posts: 3728
Location: Australia
The Edcor OPTs are nuts!

_________________
Projects: "Parley" - Tube preamp with Pass B1 buffer | "Sanguine" - 6AS7 Headphone amp with Sophia Mesh Plate 274B rec. tube | "Black Lace" - all Ozzie tube 6V6 Power amp - old school
Website: [ retro-thermionic ]


Top
 Profile  
 
PostPosted: 01 Mar 2012, 13:38 
Offline
Editor
User avatar

Joined: 28 May 2008, 21:53
Posts: 4245
Location: Winnipeg, CANADA
mwhouston wrote:
The Edcor OPTs are nuts!

Yeah, they look about twice as thick as the power transformer! :evil:
Cheers

_________________
[ DIY Mains AC Power Cable Cord ] - [ K-12 Tube Amp Kit ] - [ Tang Band D4-1 Horn Speaker Kit ] - [ Monoblock Push-Pull KT88 Tube Amp Kit ]


Top
 Profile  
 
PostPosted: 01 Mar 2012, 15:11 
Offline
Project Author
User avatar

Joined: 06 Jun 2008, 18:23
Posts: 3728
Location: Australia
Gio wrote:
mwhouston wrote:
The Edcor OPTs are nuts!

Yeah, they look about twice as thick as the power transformer! :evil:
Cheers

Yes they are bigger than the 30W Hammonds in the Silver Dragon.

_________________
Projects: "Parley" - Tube preamp with Pass B1 buffer | "Sanguine" - 6AS7 Headphone amp with Sophia Mesh Plate 274B rec. tube | "Black Lace" - all Ozzie tube 6V6 Power amp - old school
Website: [ retro-thermionic ]


Top
 Profile  
 
PostPosted: 02 Mar 2012, 01:05 
Offline
Project Author
User avatar

Joined: 06 Jun 2008, 18:23
Posts: 3728
Location: Australia
I have just been given the news that the bases are ready and I'm picking them up tomorrow.. Though I have to give them a final sand and align the support posts there is little else to do. Usually I would use a spray varnish to seal the timber this time I may use beeswax to finish off the surface. I'm told the timbre is spotted gum. Don (who's making the bases) likes to oil the timber rather than varnish so I may just change my tact and go with the beeswax. Not only that I have four tins of the stuff.

I had to decide a colour for the top plates. In the past this has been Woodlands Gray, Black and Sungold (yellow). This time I have selected red. Its a bright red too. I have some time before I have to spray and there is a slight chance the final colour may change. Also I am having problems finding a mounting bracket for the motor start 30uf cap. This may go and a 10uf 450V electro may take its place.

_________________
Projects: "Parley" - Tube preamp with Pass B1 buffer | "Sanguine" - 6AS7 Headphone amp with Sophia Mesh Plate 274B rec. tube | "Black Lace" - all Ozzie tube 6V6 Power amp - old school
Website: [ retro-thermionic ]


Top
 Profile  
 
PostPosted: 12 Mar 2012, 01:48 
Offline
Project Author
User avatar

Joined: 06 Jun 2008, 18:23
Posts: 3728
Location: Australia
Bases are ready, plates are drilled. This lot took 5 hours. I was hoping to have the plates prepped and primed and the bases finished and oiled. BUT this all took so long I'm stuffed. Tomorrow prep the plates, prime and prep the bases and oil.

I may even get the top coat on. And the colour is???
Attachment:
Plates.jpg


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


_________________
Projects: "Parley" - Tube preamp with Pass B1 buffer | "Sanguine" - 6AS7 Headphone amp with Sophia Mesh Plate 274B rec. tube | "Black Lace" - all Ozzie tube 6V6 Power amp - old school
Website: [ retro-thermionic ]


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 154 posts ]  Go to page Previous  1 ... 7, 8, 9, 10, 11, 12, 13 ... 16  Next

All times are UTC - 6 hours [ DST ]


Who is online

Users browsing this forum: Google [Bot] 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 / Opamp Projects :: DIY Phono Projects :: DIY Cable Projects :: HI-Fi Audio Schematics
© diyAudioProjects.com - Terms of Service - Privacy Policy