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 18 Nov 2019, 17:52

All times are UTC - 6 hours [ DST ]




Post new topic Reply to topic  [ 106 posts ]  Go to page Previous  1 ... 7, 8, 9, 10, 11
Author Message
PostPosted: 18 Apr 2017, 17:53 
Offline
Project Author
User avatar

Joined: 06 Jun 2008, 18:23
Posts: 5144
Location: Australia
Personally I'd go for the 8" in the simpler ported box. A lot more bass.

_________________
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: 19 Apr 2017, 00:57 
Offline
User avatar

Joined: 07 Mar 2017, 13:41
Posts: 9
Location: Bend, OR
I'll take a look. Btw the wine bottle amp on your website is beautiful


Top
 Profile  
 
PostPosted: 19 Apr 2017, 04:27 
Offline
Project Author
User avatar

Joined: 06 Jun 2008, 18:23
Posts: 5144
Location: Australia
johnyo wrote:
I'll take a look. Btw the wine bottle amp on your website is beautiful


Thanks have some more planned.

_________________
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: 25 Jul 2019, 07:35 
Offline

Joined: 19 Oct 2018, 15:30
Posts: 132
Location: Montréal, Québec
Hi everyone ! I have two questions about this amp. I planned on building a SE 6V6 amp with two valves per channel, but had to let down the project after I realized that the circuit couldn’t reach my goals, and that the provided power figures were (WAY TO MUCH) overestimated. This brings me back to the starting point, but after having drilled and painted an enclosure for it. I am now looking for a new (good) circuit to build up. The first schematic was for a 6sj7/6v6 SE amp, so I have 4 octal holes in my hammond chassis. (Beware, schematic published on this website...)

Now that I introduced my situation, here are my questions :

- How can I modify the output stage to run in pentode mode ? I guess that the screen needs to be connected elsewhere, but not shure enough to take the guess.
- can I use two 6J5 instead of the 6SN7 while getting the same results ? I’ve read that they are equivalent but just want to be shure of the compatibility.

Thanks for your help !


Top
 Profile  
 
PostPosted: 25 Jul 2019, 16:47 
Offline
Project Author
User avatar

Joined: 06 Apr 2009, 10:08
Posts: 1594
Location: US Pacific Northwest
Gab wrote:
- How can I modify the output stage to run in pentode mode ? I guess that the screen needs to be connected elsewhere, but not shure enough to take the guess.
This is simple. The screen needs to be tied to a DC voltage. Due to the variation of screen voltage with drive, this is best accomplished with an appropriately decoupled tap off the B+. Just make sure that your screen voltage at idle is less than or equal to your effective plate voltage. Otherwsie screen dissipation can climb to unacceptable levels.
Gab wrote:
- can I use two 6J5 instead of the 6SN7 while getting the same results ? I’ve read that they are equivalent but just want to be shure of the compatibility.
Yes, the plate characteristics of the 6SN7 and the 6J5 are very close. Just keep in mind that the interelectrode capacitances of the 6J5 are significantly higher than the 6SN7 so you'll need to keep an eye on the high end rolloff.

_________________
Matt
It's all about the Glass!
http://www.CascadeTubes.com
Cascade Tubes Blog


Top
 Profile  
 
PostPosted: 28 Jul 2019, 07:56 
Offline

Joined: 19 Oct 2018, 15:30
Posts: 132
Location: Montréal, Québec
Perfect ! Thanks !


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 106 posts ]  Go to page Previous  1 ... 7, 8, 9, 10, 11

All times are UTC - 6 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 16 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