|
|||||||
| Home | Forums | Rules | Articles | Store | Gallery | Blogs | Register | Donations | FAQ | Calendar | Search | Today's Posts | Mark Forums Read | Search |
| Headphone Systems Everything to do with Headphones |
  |
|
|
|
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 |
22nd June 2009, 11:56 AM
|
#23 |
|
diyAudio Member
Join Date: Oct 2003
Location: middle of nowhere...
|
i mean - this is very strange - 100uF is not enough as a coupling capacitor...
when i was using only a buffer (without the tube part) the frequency range was perfectly o.k.... now.. it is not enough - what is happening there??? it seems like the input resistance of the buffer is a lot lower than it should be...... ??? ohhh... btw - i just remebered..... i have a capacitor over a cathode resistor of the tube - it is 220uF capacitor - i have to check if that one is big enough... |
|
|
22nd June 2009, 12:09 PM
|
#24 |
|
diyAudio Member
Join Date: Oct 2003
Location: middle of nowhere...
|
o.k. - i tried also to change the cathode capacitor to a 550uF value - almost no change in the bass segment....
so it seems that the coupling cap between the tube and mosfet stage is not nearly enough like it should be ... |
|
|
|
23rd June 2009, 02:52 PM
|
#26 |
|
diyAudio Member
Join Date: Oct 2003
Location: middle of nowhere...
|
oh yes... it was sooo dead....
 buffer was dead - i assume that the tube burned the mosfet because i didn't put any zener diodes between gate and source... idiot....  anyway.. i tried 12B4 part alone .. it drives the headphones like a charm - no problem ... 20mA, Ug=10V, Up=106V.... perfect... sound is powerfull and detailed... very clear... i will remove the buffer for now and make it with 12B4 only.... it works nice.... |
|
|
|
| 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 |
| MOSFET follower headphone amplifier | GRollins | Headphone Systems | 124 | 20th July 2011 03:11 PM |
| HLLY MK III 3 Vacuum Tube Headphone Amplifier Pre Amp | hllyelec | Vendor's Bazaar | 2 | 19th July 2009 05:54 AM |
| A Tube Hybrid Headphone Amplifier | TzeYang | Headphone Systems | 5 | 10th September 2008 11:22 PM |
| single mosfet headphone amplifier question | Jean | Headphone Systems | 8 | 23rd June 2007 11:50 PM |
| Sennheiser HD-580 with OTL tube headphone amplifier | Nixie | Swap Meet | 1 | 27th February 2007 11:40 PM |
| New To Site? | Need Help? |
| Page generated in 0.08649 seconds (73.68% PHP - 26.32% MySQL) with 11 queries |
