|
|||||||
| Home | Forums | Rules | Articles | Store | Gallery | Blogs | 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 |
| diyAudio Sponsor | ||
|
||
 |
|
|
Thread Tools | Search this Thread |
23rd August 2011, 03:09 PM
|
#1 |
|
diyAudio Member
Join Date: Aug 2011
Location: Chonburi
|
My small tube does it work?
Hello,help me please
I just finish assembly EL34 PP (Assembly kit) but I have question why 12AX7 tube the heater have't a light? Compare with 6N3 buffer tube it has. I connect 6.3V to EL34 and 12AX7. > 4 lines (Current 2A/line) Thank you |
|
|
23rd August 2011, 03:48 PM
|
#2 | |
|
diyAudio Member
Join Date: Jun 2010
Location: UK
|
Quote:
If you have a look at this link it's a PDF. The 12AX7 has two heaters if they are wired in series then thats 12V they are 6.3v each. So at a first guess you have them in series and they should be in parallel for 6.3V. Link: http://www.r-type.org/pdfs/12ax7.pdf If you are not sure then join pins 4 and 5 togeather and put the heater supply across 4-5 and 9 Regards M. Gregg
__________________
What is the sound of one hand clapping? Last edited by M Gregg; 23rd August 2011 at 04:11 PM. |
|
|
|
|
23rd August 2011, 04:39 PM
|
#3 | |
|
diyAudio Member
Join Date: Aug 2011
Location: Chonburi
|
Quote:
Thank you for you quoted, I'm recheck again. I connected joint 4,5 to 6.3V and joint 9 connected to ground. 
|
|
|
|
|
23rd August 2011, 04:49 PM
|
#4 | |
|
diyAudio Member
Join Date: Jun 2010
Location: UK
|
Quote:
This can cause problems with heater to cathode leakage. Pin 9 is one side of the heater pins 4-5 are the other. Don't use pin 9 to hum buck. Use some 220 ohm resistors from each side of the heater supply to Gnd. Regards M. Gregg
__________________
What is the sound of one hand clapping? |
|
|
|
|
24th August 2011, 12:51 AM
|
#5 |
|
diyAudio Moderator
|
Actually pins 4&5 should be connected together to one side of the 6.3V supply and pin 9 to the other..
Hopefully your filament supply does not use the chassis for the filament return. Good ingredient for hum if you are doing this..
__________________
www.kta-hifi.net |
|
|
|
30th August 2011, 04:12 PM
|
#8 |
|
diyAudio Moderator
|
Good news!
__________________
www.kta-hifi.net |
|
|
|
| Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
| Thread Tools | Search this Thread |
|
|
Similar Threads
|
||||
| Thread | Thread Starter | Forum | Replies | Last Post |
| 6n6p tube as output tube for small guitar amp | moonbird | Tubes / Valves | 28 | 7th September 2011 04:28 AM |
| Can the 7AK7 computer tube work as audio output tube ? | aldovan | Tubes / Valves | 10 | 24th August 2011 06:22 PM |
| Small speaker with passive radiator. Will this work | hooligan72 | Multi-Way | 2 | 19th May 2011 10:17 PM |
| Small speakers for a small tube amp | jeppix | Full Range | 17 | 29th January 2010 08:10 AM |
| suggestions; looking for shallow 10 or 12" woofer to work in small sealed box | zuki | Multi-Way | 6 | 1st April 2004 06:21 AM |
| New To Site? | Need Help? |
| Page generated in 0.08751 seconds (82.60% PHP - 17.40% MySQL) with 11 queries |
