805 SE amplifier

tool0.0book · 9th April 2006, 07:10 AM

this is my friend Tubalu's 805 SE amplifier .25kg each

rcavictim · 9th April 2006, 08:01 AM

I hope Tubalu has no children (human or pets) in the same home. Those are what I classify as "electric chair amplifiers". 805's really need to be inside a protective housing.

It looks like they are running with about 20 mA too much plate current.

805's sound very good in SET. I have an 805 SET amp myself and absolutely love it. It sits on the floor between my speakers. The 805's are safely enclosed and I have children (cats).

tool0.0book · 9th April 2006, 08:29 AM

To be continued , more pictures will be posted

astouffer · 9th April 2006, 06:08 PM

Is it me or do the plates look a bit red?

rcavictim · 9th April 2006, 09:02 PM

Quote:

Originally posted by astouffer
Is it me or do the plates look a bit red?

Your valid concern has already been presented Stouffer. See post #2.

I observed the same plate color as visible in the picture presented above which I though excessive when Chinese 805's are placed in my amp with the same bias setting that the good old North American stock 805's like RCA and Westinghouse operate without color while proviiding full power. It may just be that these Chinese repro tubes need to rev faster to develop rated horsepower.

tubalu · 10th April 2006, 04:47 AM

This amplifier is being debugged, I am experimenting two kind of different parameters
I think it is photographic prolonged exposure results ,Indeed, the plate is not red .
Finally, my 805 tube work in 850V plate voltage and plate current is 100mA, Shuguanag products are used, the quality has been very good , In addition, improved version of the 805A I am also prepared to try!

tubalu · 10th April 2006, 04:47 AM

Thank you for your concern,My son although only then three years old half, but he is very clever, he know away from high voltage.
Moreover,I hoped you also try the Shuguang's805A

rcavictim · 10th April 2006, 06:41 AM

tubalu,

You certainly are not overheating 805's with only 85 watts PD. Yes, it must be a photohgraphic effect we see.

I have had good luck with my limited experience with Shuguang tubes. The 805's I tried that got a bit red were Shuguang and they sounded good. I have no need to purchase any other 805's as I am fortunate to have 6 pairs of old stock American type 805's (i.e. RCA, Westinghouse, GE) as ready spares.

It is up to you to provide a safe environment in your home. All I can do is urge you to reconsider the safety hazard that an open transmiting tube can pose in a home environment. That large, very hot tube could explode if water dripped on it, or burn someone, or electrocute anyone touching tube cap. Accidents happen and in this case can be prevented. Death is permanent.

tubalu · 10th April 2006, 09:04 AM

Yes! Your consideration is correct! I will note this! Thank you!

tubalu · 10th April 2006, 03:01 PM

In addition, I would like to tell you £º
The 805 that china produced is good than the other imports£¨Including RCA, Westinghouse, GE£©, is unique in the world. It is the security of the guaranteed .
Shuguang tube's manual said: the 805 tube is made of graphite and it's plate do not allow to send the red light.
This is a common sense!

rgds
tubalu

9th April 2006, 07:10 AM	#1
tool0.0book diyAudio Member Join Date: Mar 2006 Location: Nantong,Jiangsu,China	805 SE amplifier this is my friend Tubalu's 805 SE amplifier .25kg each

10th April 2006, 06:41 AM	#8
rcavictim diyAudio Member Join Date: Jun 2004 Location: Cool end of a soldering iron NW of Toronto	tubalu, You certainly are not overheating 805's with only 85 watts PD. Yes, it must be a photohgraphic effect we see. I have had good luck with my limited experience with Shuguang tubes. The 805's I tried that got a bit red were Shuguang and they sounded good. I have no need to purchase any other 805's as I am fortunate to have 6 pairs of old stock American type 805's (i.e. RCA, Westinghouse, GE) as ready spares. It is up to you to provide a safe environment in your home. All I can do is urge you to reconsider the safety hazard that an open transmiting tube can pose in a home environment. That large, very hot tube could explode if water dripped on it, or burn someone, or electrocute anyone touching tube cap. Accidents happen and in this case can be prevented. Death is permanent. __________________ I.Q.Test. Have you ever purchased a recreational snowmobile?

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9th April 2006, 08:01 AM	#2
rcavictim diyAudio Member Join Date: Jun 2004 Location: Cool end of a soldering iron NW of Toronto	I hope Tubalu has no children (human or pets) in the same home. Those are what I classify as "electric chair amplifiers". 805's really need to be inside a protective housing. It looks like they are running with about 20 mA too much plate current. 805's sound very good in SET. I have an 805 SET amp myself and absolutely love it. It sits on the floor between my speakers. The 805's are safely enclosed and I have children (cats). __________________ I.Q.Test. Have you ever purchased a recreational snowmobile?

9th April 2006, 08:29 AM	#3
tool0.0book diyAudio Member Join Date: Mar 2006 Location: Nantong,Jiangsu,China	To be continued , more pictures will be posted

9th April 2006, 06:08 PM	#4
astouffer diyAudio Member Join Date: Jun 2004 Location: Pittsburgh, crumbling wasteland	Is it me or do the plates look a bit red?

10th April 2006, 04:47 AM	#6
tubalu diyAudio Member Join Date: Sep 2005	This amplifier is being debugged, I am experimenting two kind of different parameters I think it is photographic prolonged exposure results ,Indeed, the plate is not red . Finally, my 805 tube work in 850V plate voltage and plate current is 100mA, Shuguanag products are used, the quality has been very good , In addition, improved version of the 805A I am also prepared to try!

10th April 2006, 09:04 AM	#9
tubalu diyAudio Member Join Date: Sep 2005	Yes! Your consideration is correct! I will note this! Thank you!

10th April 2006, 03:01 PM	#10
tubalu diyAudio Member Join Date: Sep 2005	In addition, I would like to tell you £º The 805 that china produced is good than the other imports£¨Including RCA, Westinghouse, GE£©, is unique in the world. It is the security of the guaranteed . Shuguang tube's manual said: the 805 tube is made of graphite and it's plate do not allow to send the red light. This is a common sense! rgds tubalu