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 23 Jan 2021, 09:33

All times are UTC - 6 hours [ DST ]

Post new topic Reply to topic  [ 1 post ] 
Author Message
PostPosted: 29 Dec 2019, 09:47 

Joined: 30 Aug 2017, 09:49
Posts: 44
To improve you transmit audio on your Viking 2. Replace the inner stage modulation transformer with a Hammond 124B. The stock transformer does not have enough band with. Replace all capicatiors. Change all coupling capacitors to .02 600 volt. Change the bypass cathode cap on the first 6au6 to 50mfd 50v. Change the driver 6au6 to a 6c4. For a cathode resistor for the 6c4 use 1.5k 1watt and 220mg 50 volt cathode cap.Also add a 220.mfd 450 volt cap from R3, 470k R32 1meg and R5 to ground. This gives better voltage stability to audio preamp also reduces noise. This is far better than stock audio T driver 6au6 does not have to be replaced but if used change cathode bypass cap to 50mfd 50v. That is if you want to keep stock tube lineup. The 6c4 does work better. I have had good reports on air about my audio. Got to love these boat anchors.

Alpha Wolf

Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 1 post ] 

All times are UTC - 6 hours [ DST ]

Who is online

Users browsing this forum: No registered users and 1 guest

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
© - Terms of Service - Privacy Policy