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 13 Dec 2018, 02:41

All times are UTC - 6 hours [ DST ]




Post new topic Reply to topic  [ 3 posts ] 
Author Message
PostPosted: 22 Nov 2018, 11:15 
Offline

Joined: 19 Oct 2018, 15:30
Posts: 35
Location: Montréal, Québec
I have a hammond 1650r opt. It’s rated at 100w and 5k ct. do you have any ideas of a circuit design I could build to put this iron to use ?


Top
 Profile  
 
PostPosted: 22 Nov 2018, 12:06 
Offline
Project Author
User avatar

Joined: 06 Apr 2009, 10:08
Posts: 1497
Location: US Pacific Northwest
Gab wrote:
I have a hammond 1650r opt. It’s rated at 100w and 5k ct. do you have any ideas of a circuit design I could build to put this iron to use ?
Well, for starters there is the suggestion from the Hammond webpage suggesting push-pull configurations of the following tubes: 807, 5881, EL34, 6146B, 6550B, KT88. Since max DC per side is rated at 318mA you should be able to run quads of at least some of these depending on bias.
Attachment:
1650R Tube Suggestions.jpg

You will note that the transformer is only rated down to 30Hz. This is actually a clue about the transformer primary. The inductance of the primary is likely substantial. This means when choosing tubes and configurations you'll need to pay attention to plate resistance and likely will need to design for some negative feedback to control the overall damping factor.

For simplicity I would suggest an odd-block configuration with a pair of KT88s. This is a known quantity with good performance. And if you have any issues with your build there is a wealth of experience here to help out.


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


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


Top
 Profile  
 
PostPosted: 23 Nov 2018, 14:15 
Offline

Joined: 19 Oct 2018, 15:30
Posts: 35
Location: Montréal, Québec
I will have a look at the odd-block. Thanks for the informations ! I don’t know if I sell it to buy the exact ones i’ll need or if I build an amp around this transformer model. I am concerned about using an older transformer in one channel and a newer one in the other channel. The one I have has never been used, but it’s like 10 years old.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 3 posts ] 

All times are UTC - 6 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 15 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