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 24 Jan 2020, 11:46

All times are UTC - 6 hours [ DST ]

Post new topic Reply to topic  [ 3 posts ] 
Author Message
PostPosted: 30 Dec 2018, 03:24 

Joined: 30 Dec 2018, 03:00
Posts: 1
modded dynaco st 70 with octal triodes. it is hard on rectifiers, a sign of failure is when they start making popping noises. the GZ34 i had been using was allowing noises through even during softstart. a new sovtech 5AR4 does not seem to come out of softstart. all the tubes are lit up, but no sound, not even hiss. I know the amp and inputs are ok because the old reg tube did provide power enough for sound, just with loud pops. With the new sovtek it is iust dead quiet, no sound. Could there be an issue with a component, or does it mean the new 5AR4 is bad? i dont want to trouble the 5AR4 seller with a doa return without confirming if this could be a system issue or loose wire. i did the build myself and can open it up if needed. any advice much appreciated.

PostPosted: 31 Dec 2018, 11:46 
User avatar

Joined: 02 Mar 2009, 12:41
Posts: 1110
Location: Vänersborg, Sweden
Is the 5AR4 really capable of supplying the required current? Just asking, as I don’t have the schematics.


“If you don't know where you are going, any road will get you there.”
―Lewis Carroll

PostPosted: 07 Jan 2019, 11:55 

Joined: 29 May 2011, 12:24
Posts: 51
Location: Netherlands
Sounds to me there is more going on than just a rectifier issue alone. Is it a recent build and did it have these issues from the start? Did you check all the voltages and bias in the amp? Does the amp still 'work' when you put the old GZ34 back in place?

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 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
© - Terms of Service - Privacy Policy