|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|
|28th June 2008, 10:10 AM||#1|
Join Date: Jan 2008
Location: Athens, Greece
Quad Ii Tubes Replacement
I am trying several tubes to a Quad II pair.
I tried 6L6G, Russian 5881 (6p3n), GEC KT66, EL37, and I will try also the EL39.
It seems that EL37 sounds better than KT66, KT66 better than 6L6G, 6L6G better than Russian 5881 (6p3n).
The cathode resistor was a 180 Ohm /3W. I replaced for a 180 Ohm/5W.
I was looking for information in data books and I find that the suggested cathode resistor for the original KT66 is 160 Ohm, same for the 6L6, 120 Ohm for the EL37 and no info about EL39.
I suppose that when I am using EL37 I have to change the 180 Ohm cathode resistor for an around 135 Ohm (180/160*120).
What about EL39, is 135 Ohm the correct resistor?
What about 6550, is it suitable?
I will try also to replace the EF86 for EF37A, has anybody the experience?
|Thread Tools||Search this Thread|
|Thread||Thread Starter||Forum||Replies||Last Post|
|quad 303 pcb -- direct replacement / modification||bigpanda||Swap Meet||5||9th June 2016 10:49 PM|
|Beard P35 and Tubes Replacement||greytear||Tubes / Valves||4||30th September 2010 09:40 PM|
|FOR SALE: 6528 Tubes (Used/Tested Quad)||Diogenio||Swap Meet||4||30th April 2009 02:43 PM|
|Tubes: NOS Cetron JAN 6336B quad set||wildmonkeysects||Swap Meet||0||1st May 2008 03:52 AM|
|Replacement driver boards for the Quad 303||Rjones5296||Solid State||4||7th January 2005 04:09 PM|
|New To Site?||Need Help?|