|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
||Thread Tools||Search this Thread|
|11th April 2006, 02:47 PM||#1|
Join Date: Mar 2005
Location: Edam, The Netherlands
Changing 6DJ8 SRPP stage gain
Just a quick question really. I have a textbook SRPP line stage with a 6DJ8 (ECC88) following the passive I/V and filter on a DAC which is set to amplify ~16x. The V+ voltage on the top triode is 180-volts and both cathode resistors are 100-ohm. The impedance of the load it is supposed to drive is ~10K-ohm.
I've made a few modifications to the passive filter yielding lower voltage output which means I'll have to raise the gain to meet my 2Vrms output requirement. Currently the gain is ~16.5x (24dB) but I'll need to raise it to ~25x (28dB) and the simplest way I can think of is to raise the value of the kathode resistor on the upper SRPP triode. If I raise it to 470-ohms (from 100-ohm) I meet the gain requirement.
Now here's the question; will this offset the balance between the two triodes much as they're running in a push-pull configuration?
Any suggestions are most welcome!
Acception without proper examination equals religion
Condemnation without proper examination equals prejudice
|Thread Tools||Search this Thread|
|Thread||Thread Starter||Forum||Replies||Last Post|
|Too much gain - help with changing driver tube.||colinB||Tubes / Valves||15||21st November 2008 10:09 PM|
|Control gain by changing supply voltage?||preiter||Class D||11||18th June 2008 01:30 PM|
|srpp input stage||nhuwar||Tubes / Valves||11||31st July 2007 11:03 PM|
|Changing the NFB resistor to balance gain.||troystg||Solid State||6||7th May 2004 01:06 PM|
|Lowering gain in 12AX7 SRPP preamp||net-david||Tubes / Valves||26||23rd December 2003 06:55 PM|
|New To Site?||Need Help?|