help on amp gain structure
 User Name Stay logged in? Password
 Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read Search

 Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

 Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
 16th December 2010, 10:58 PM #1 nicoch58   diyAudio Member   Join Date: Oct 2004 help on amp gain structure HI Anyone have link to learning how calculate the gain structure / input V ? I'm building 10y or 26>10y>300b 10y amplification is 8 ,400v 25ma on IT to eml300bxls amplification is 3.9 ,the 26 is 8.3 now 8x8x3.9 near 250 how many V in the input ? thanks Manu my jfet phono is 9vrms but the new tubes 1,5v ....speakers 93db
 16th December 2010, 11:47 PM #2 pieter t   diyAudio Member   Join Date: Apr 2009 Manu, It is easiest to calculate backwards. The typical 300B needs around 55 VRMS at the grid for full power, maybe the super 300B type a bit more. Your 10 driver tube with 1:1 interstage transformer will have a gain equal to mu, so that is 8. 55 divided by 8, OK we need another 7 VRMS when we look or an input sensitivity of 1 VRMS. That will be nicely supplied by your 26 or 10Y first tube. When your jet phono delivers a good 9 VRMS try also to skip the first tube (when a tube is not really necessary skip it, the less active stages the better). Amplifier gain structure has nothing to do with speakers. (working on your transormers).
 17th December 2010, 12:01 AM #3 nicoch58   diyAudio Member   Join Date: Oct 2004 Hello Pieter tribute nice iron!! On gain side the new phono is 1,5v max .... but this 7vrms need for the driver how many gain db are (6?) ? ie can be delivery from a tvc with some stepup (2k source) ? just to kiss Last edited by nicoch58; 17th December 2010 at 12:04 AM.
 17th December 2010, 12:09 AM #4 pieter t   diyAudio Member   Join Date: Apr 2009 7 VRMS related to 1,5 VRMS is a little over 13 dB. I don't like the idea of using tvc's with step up ratios; for gain with a transformer you are very dependent on source and load impedances. My inductive volume control has no step up. They simply work best as step down (auto)transformers. For necessary voltage amplification it is best to use active devices.

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is Off Forum Rules
 Forum Jump User Control Panel Private Messages Subscriptions Who's Online Search Forums Forums Home Site     Site Announcements     Forum Problems Amplifiers     Solid State     Pass Labs     Tubes / Valves     Chip Amps     Class D     Power Supplies     Headphone Systems Source & Line     Analogue Source     Analog Line Level     Digital Source     Digital Line Level     PC Based Loudspeakers     Multi-Way     Full Range     Subwoofers     Planars & Exotics Live Sound     PA Systems     Instruments and Amps Design & Build     Parts     Equipment & Tools     Construction Tips     Software Tools General Interest     Car Audio     diyAudio.com Articles     Music     Everything Else Member Areas     Introductions     The Lounge     Clubs & Events     In Memoriam The Moving Image Commercial Sector     Swap Meet     Group Buys     The diyAudio Store     Vendor Forums         Vendor's Bazaar         Sonic Craft         Apex Jr         Audio Sector         Acoustic Fun         Chipamp         DIY HiFi Supply         Elekit         Elektor         Mains Cables R Us         Parts Connexion         Planet 10 hifi         Quanghao Audio Design         Siliconray Online Electronics Store         Tubelab     Manufacturers         AKSA         Audio Poutine         Musicaltech         Aussie Amplifiers         CSS         exaDevices         Feastrex         GedLee         Head 'n' HiFi - Walter         Heatsink USA         miniDSP         SITO Audio         Twin Audio         Twisted Pear         Wild Burro Audio

 Similar Threads Thread Thread Starter Forum Replies Last Post thanhVNS Multi-Way 4 31st May 2008 11:55 PM RCA245 Tubes / Valves 2 11th May 2005 07:32 AM 454Casull Multi-Way 2 3rd August 2004 01:40 AM UltimateX86 Solid State 9 16th July 2004 10:50 AM

 New To Site? Need Help?

All times are GMT. The time now is 08:11 PM.