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 16 Jul 2018, 03:40

All times are UTC - 6 hours [ DST ]




Post new topic Reply to topic  [ 394 posts ]  Go to page Previous  1 ... 33, 34, 35, 36, 37, 38, 39, 40  Next
Author Message
 Post subject: Re: KT120 Oddblocks
PostPosted: 05 Apr 2018, 02:18 
Offline

Joined: 24 Oct 2010, 07:05
Posts: 266
There could be any number of problems if you use a transformer out of conditions it was designed. I read the Bruce's explanations just before your latest message (and fully support them) like that: testing a transformer out of the circuit is useless.


Top
 Profile  
 
 Post subject: Re: KT120 Oddblocks
PostPosted: 05 Apr 2018, 06:55 
Offline

Joined: 07 Mar 2017, 03:14
Posts: 67
Thank you, Poty. I think you both are right. Well, another question in my mind is that should I use a load on the secondary when testing the transformer attached to the circuit? If I should, is it ok to use a 8.2 ohm 50 watt resistor. Cause I don't want to do any harm to my speakers.

My bests,
Ozan


Top
 Profile  
 
 Post subject: Re: KT120 Oddblocks
PostPosted: 05 Apr 2018, 16:27 
Offline
Project Author
User avatar

Joined: 04 Jun 2008, 20:59
Posts: 3707
Location: Arizona, USA
Hi, If you are testing an amp yes. Use a load all the time. Without a load any testing will not reflect what the amp is doing. Resistors are cheap and have essentially linear behavior as a load. Far better IMO than a speaker which will have impedance variations and phase shifts because of the crosssovers.

Good listening
Bruce

_________________
Some of my DIY Tube Amplifier Projects:


Top
 Profile  
 
 Post subject: Re: KT120 Oddblocks
PostPosted: 09 Apr 2018, 02:29 
Offline

Joined: 07 Mar 2017, 03:14
Posts: 67
Connecting 8.2 ohm load to the secondary removed ringing problem on the scope although I didn't connect the OPT primary to amp circuit. So far, so good.
My bests,
Ozan


Top
 Profile  
 
 Post subject: Re: KT120 Oddblocks
PostPosted: 12 Apr 2018, 16:46 
Offline
User avatar

Joined: 29 Mar 2013, 20:37
Posts: 129
Location: Italy
Hey guys. after much wait (and weight.. ) my Edcors arrived. Damn they are massive! Right now i am setting up a new shop for my business so free time went out of the window. this will be another summer project ;(


Top
 Profile  
 
 Post subject: Re: KT120 Oddblocks
PostPosted: 12 Apr 2018, 20:40 
Offline
Project Author
User avatar

Joined: 04 Jun 2008, 20:59
Posts: 3707
Location: Arizona, USA
Hi, Yes indeed they are huge. You need ones that large to safely handle the dc current as this is a class A design and the current is essentially constant at around 280ma in the output trannies. The power trannie needs to be able to deliver that at around 450 volts. That is a bunch of watts. :hot:

Good listening
Bruce

_________________
Some of my DIY Tube Amplifier Projects:


Top
 Profile  
 
 Post subject: Re: KT120 Oddblocks
PostPosted: 13 Apr 2018, 13:56 
Offline
User avatar

Joined: 29 Mar 2013, 20:37
Posts: 129
Location: Italy
It's a room heater that also dubs as amplifier ;)


Top
 Profile  
 
 Post subject: Re: KT120 Oddblocks
PostPosted: 13 Apr 2018, 15:26 
Offline
Project Author
User avatar

Joined: 04 Jun 2008, 20:59
Posts: 3707
Location: Arizona, USA
Hi, Yeah. I love multi tasking devices. Also good for developing muscles. Just lift one up about 10 times a day for better biceps. :blush:

good listening
Bruce

_________________
Some of my DIY Tube Amplifier Projects:


Top
 Profile  
 
 Post subject: Re: KT120 Oddblocks
PostPosted: 27 Apr 2018, 14:57 
Offline
User avatar

Joined: 29 Mar 2013, 20:37
Posts: 129
Location: Italy
First PSU board ready. Now to do the other channel. How many volts should be the heater circuit be elevated at? I am getting around 50volts on mine

Image


Top
 Profile  
 
 Post subject: Re: KT120 Oddblocks
PostPosted: 27 Apr 2018, 15:47 
Offline

Joined: 23 Feb 2017, 02:02
Posts: 130
62k/(62k+220k)(300v)=66v
The orignal circit is seen to be a 62k and 220k voltage divider from 300v to heaters to elevate it

having 50v is correct and allright


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



Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 394 posts ]  Go to page Previous  1 ... 33, 34, 35, 36, 37, 38, 39, 40  Next

All times are UTC - 6 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 9 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