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.
in fact I have moved it Tony.
Last edited:
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
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
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
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
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
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
Planning new AMP
Planning for new AMP… (Do not want to build these amps 845,211,813 75TL...) I am looking for your input and technical expertly. Thank you, Rookies
In stock:
1-pair X-10S
1-pair UTC S-47
2 pairs 10H/300A
2 pair’s 50uF/2KV
2 pairs 3B28
Some miscellaneous in my garage (oil Cap, Res, diode, mechanical parts, socket, driver tube e.e )
If need interstage (I will buy one pair)
Planning for new AMP… (Do not want to build these amps 845,211,813 75TL...) I am looking for your input and technical expertly. Thank you, Rookies
In stock:
1-pair X-10S
1-pair UTC S-47
2 pairs 10H/300A
2 pair’s 50uF/2KV
2 pairs 3B28
Some miscellaneous in my garage (oil Cap, Res, diode, mechanical parts, socket, driver tube e.e )
If need interstage (I will buy one pair)
Since a had a scare with high voltages, I am planning to build an under-volted (600Vdc) SE 813, pentode mode amp. Does anyone have any info or experience on running the 6HV5A at lower voltages. From what I have read, at high voltages (2000V), generates considerable distortion. I am hoping that the reverse is true and that there are no unforeseen issues.
813 help review
What I know 6HV5 or 6HS5 does not work well under 1KV. If you are can work with 600V why not go to 1KV. Mr. Thomas from vinylsavor recommends me a choke load or transformer coupling. I would like to try this but I do not have these in house so I use 20K resistor load work very well.
I would like to Thank you many people in here help me to correct 813 schematic.
Best regards
Rookies
Kheper if you are in North CA I can help you (408 890 9100)
What I know 6HV5 or 6HS5 does not work well under 1KV. If you are can work with 600V why not go to 1KV. Mr. Thomas from vinylsavor recommends me a choke load or transformer coupling. I would like to try this but I do not have these in house so I use 20K resistor load work very well.
I would like to Thank you many people in here help me to correct 813 schematic.
Best regards
Rookies
Kheper if you are in North CA I can help you (408 890 9100)
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