Welcome, Guest. Please Login or Register
Decware Audio Forums
03/28/24 at 14:12:55 




Pages: 1
Send Topic Print
USING UNBALANCED INPUT TUBES (Read 252 times)
Rivieraranch
Seasoned Member
****




Posts: 2126
USING UNBALANCED INPUT TUBES
12/17/09 at 02:23:46
 
The design notes state that the amp uses both sides of the input tube. Therefore is it important for the input tubes be balanced?

What happens over time when using a 12AT7 tube that measures 3500 on one side and 5200 on the other on one side and a tube on the other side that measures 4100/4950?
Back to top
 
 

MINI TORII & ZROCK2 both anniversaried; 'Lil Audio F-15; TECHNICS SL1200MK2 KAB MODDED TT; ONKYO 6 DISC CD; MARANTZ 2226B; SCHIIT MULTIBIT DAC; SENNHEISER HD-580s
55   IP Logged
Lon
Seasoned Member
****


"Love without
guts is
worthless!"
Philip K. Dick

Posts: 23305
Re: USING UNBALANCED INPUT TUBES
Reply #1 - 12/17/09 at 14:18:11
 
You won't damage anything I wouldn't think.  I think you will just have a potential sonic imbalance between the two channels.
Back to top
 
 

HR-1,ZTPRE,ZBIT,ZROCK2,SEWE300B,CSP3-25mod,Taboo MkIV;Rega RP3 all GrooveTracer mods;PSAudio:PST+DSD,P15,NPC,PowerBases,AC-12 pwr cbls,Reference spkrcbls;Mapleshade SamsonV3;VooDoo:Cremona+Amati interconnects, IsoPods; headphones:Sennheiser HD800S,ZMF Ori,Oppo PM1
  IP Logged
Steve Deckert
Administrator
*****


If the 1st watt
sucks why continue?

Posts: 6234
Re: USING UNBALANCED INPUT TUBES
Reply #2 - 12/18/09 at 02:47:43
 
The first half of the tube is a gain stage that is direct coupled to the second half of the tube, so the total gain of both halves is what the channel sees.  Of course since the amp is dual mono, with dual volume controls, matching channels is done by ear.

Steve
Back to top
 
 
WWW   IP Logged
Pages: 1
Send Topic Print