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 Nov 2019, 16:09

All times are UTC - 6 hours [ DST ]




Post new topic Reply to topic  [ 12 posts ]  Go to page Previous  1, 2
Author Message
PostPosted: 07 Nov 2019, 13:50 
Offline

Joined: 21 Sep 2014, 12:07
Posts: 26
Hello Bruce,
I'm getting ready to build and expand on your "Funkywatt" design. I see on the schematic that the current needs to be set at 41.5mA per tube. You don't show them in the schematic, but can I put 1-ohm, 1% resistors between the cathodes and the LM317 for measurement like in the Oddwatt amps?
My plan is to use 6Q7GTs in place of the 12AX7s, and 2-6F5GTs for a bass and treble control. I think I'm going to call it the "5150", which is the police code for an involuntary 72-hour hold in a psychiatric facility :).


Top
 Profile  
 
PostPosted: 07 Nov 2019, 14:43 
Offline
Project Author
User avatar

Joined: 04 Jun 2008, 20:59
Posts: 4041
Location: Arizona, USA
Hi, if you use the 832s they have a tied together internal cathode arrangement and the 1 ohm resistors have to be in the anode circuit so you can tell which section is getting what current. For any tubes with separate cathodes or any separate tubes the 1 ohms could and should go in the cathode circuit, it is much safer as the voltages there are typically in the 20-40 volt range. In the anode circuit you have the full B+ and measuring it requires some care. The sound of the amps is ok but the output power is relatively small compared to typical power tubes (KT77-88 etc) . Its claim to fame IMO is its cool looks. 8-)

Good listening
Bruce

_________________
Some of my DIY Tube Amplifier Projects:


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

All times are UTC - 6 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 11 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