|
|||||||
| 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 |
1st November 2011, 07:55 AM
|
#1 |
|
diyAudio Member
Join Date: Dec 2010
|
813 review
HELP REVIEW SCHEMATIC
|
|
|
1st November 2011, 08:05 AM
|
#2 |
|
just another
diyAudio Moderator
|
Hi Calpoly1998 Welcome to diyAudio. I think that you probably should post in the Tubes forum Tubes / Valves - diyAudio
  in fact I have moved it Tony. Last edited by wintermute; 1st November 2011 at 08:12 AM. Reason: move to tubes forum |
|
|
|
1st November 2011, 08:24 AM
|
#3 |
|
diyAudio Member
Join Date: Feb 2002
Location: Lindau
|
Hi!
Some comments: The max grid leak resistance for the 813 is 50k Ohm and for the 6HV5A 100kOhm The 6HV5A will not work well with resistor plate load. I recommend a choke load or transformer coupling The 6HV5A does not need DC heater, AC will work without hum Besides that there are some drawing errors in the schematic: 813 is shown as indirectly heated and marked 300B The 6HV5A doesnot have a screen grid The rectifier in the bias supply is missing Best regards Thomas
__________________
http://vinylsavor.blogspot.com/ |
|
|
|
1st November 2011, 01:04 PM
|
#4 |
|
работник
diyAudio Member
Join Date: Jul 2004
Location: Warwickshire UK
|
The driver looks like normal grid driver, but the 813 ouput is configured as a cascode.... I think the grid and cathode have their connexions swapped.
|
|
|
|
1st November 2011, 02:33 PM
|
#5 |
|
diyAudio Member
Join Date: Apr 2002
Location: New York State USA
|
Where's the 813's screen?
Looks like someone took a schematic from someplace and changed the plate voltage value and the bias value. No way are the cathode and grid connections swapped, you can't connect the grid or the cathode to the plate supply and have it work... Is this a class project?  At "Cal Poly"??_-_-bear
__________________
_-_-bear http://www.bearlabs.com ...ur feeback please - like/dislike my what I have written? PM/email tnx. -- |
|
|
|
1st November 2011, 06:34 PM
|
#6 |
|
diyAudio Member
Join Date: Dec 2010
|
813 help review
Sorry for my laziness from last night.
Thank you many many people in here. Here is update 813 schematic. |
|
|
|
1st November 2011, 06:54 PM
|
#7 |
|
diyAudio Member
Join Date: Feb 2002
Location: Lindau
|
Hi!
Connect pin 3 of the 6HV5 to the cathode, not to plate! You might want to look at the schematic of my 211 amp which uses the 6HV5A as driver: VinylSavor: Making of a 211 Amplifier, Part 1: Planning I recommend to run the 6HV5 at a higher voltage and more current. A step down interstage will provide a more reasonable gain and nice low impedance drive to the output tube Best regards Thomas
__________________
http://vinylsavor.blogspot.com/ |
|
|
|
1st November 2011, 11:05 PM
|
#9 |
|
diyAudio Member
Join Date: Dec 2010
|
813 help review
I fixed grid bias supply circuit and connected Pin 3 to pin 4
Thank you |
|
|
|
1st November 2011, 11:27 PM
|
#10 |
|
diyAudio Member
Join Date: Dec 2010
|
Here is Actual amplifier
with all your help..
i got 25w output with less than 2% dis from (25 to 20K) Thanks, Rookies |
|
|
|
| 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 |
| How is this possible? (A hi fi review. Review) | terry j | Multi-Way | 50 | 5th June 2008 11:46 PM |
| 813 Thoughts | Steven-H | Tubes / Valves | 40 | 26th January 2008 02:24 AM |
| Your opinion on 813? | Jax | Tubes / Valves | 5 | 16th January 2004 09:10 PM |
| 813 valves | slowmotion | Tubes / Valves | 36 | 27th January 2003 11:54 PM |
| New To Site? | Need Help? |
| Page generated in 0.09975 seconds (81.40% PHP - 18.60% MySQL) with 11 queries |
