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 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

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PostPosted: 27 Dec 2013, 23:17 
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Joined: 09 Oct 2012, 19:43
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Location: Vancouver Canada
This answers my question very well. Never in parallel (without much added cir to monitor) is very clear. Thank you so much.


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PostPosted: 28 Dec 2013, 00:34 
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Location: Vänersborg, Sweden
laurie54 wrote:
I wanted to know if the 6as7 tubes can be paralleled directly. It would seem to be the answer to driving lower impedance phones such as 32 ohm.


Note that Bruce Rozenblit are using them in one of his books parallelled (to lower Zout - OTL-design). The only thing he writes about parallelling the tubes is that they should be of the same make (producer).

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PostPosted: 28 Dec 2013, 07:23 
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Joined: 12 Jun 2009, 15:43
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Location: College Station, Texas
laurie54 wrote:
This answers my question very well. Never in parallel (without much added cir to monitor) is very clear. Thank you so much.


I'm using paralleled 6082's (same as 6080 except 26V heaters) in a regular OTL for driving loudspeakers, and it works perfectly well. I'm travelling right now and can't check the series resistors I'm using with each of them; from memory it's probably 2.7ohms per section. So absolutely no problem with using them in parallel, in my experience.

[Just managed to find the schematic I'm using; indeed, 2.7 ohms per triode section. I also found Bruce Rozenblit's schematic, and he doesn't use any series resitors at all.]

Chris


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PostPosted: 11 Apr 2014, 18:42 
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Joined: 11 Apr 2014, 18:37
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Sorry I'm a noob at power supplies, I haven't built too many amps.

If I were to use https://www.edcorusa.com/xpwr182 as my tranny, and a 5U4G Rectifier, which wires from the tranny would go to which places on the B+ and Heater? And where does the B+ get connected to the amp? Obviously the heater connects to the tubes, but not sure where the b+ goes.

Sorry, and thanks in advance!


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PostPosted: 11 Apr 2014, 23:07 
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Joined: 09 Oct 2012, 19:43
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Location: Vancouver Canada
mmmmmm sch's are always great candy. Since i asked the about paralleling outs i have found a series of pics on the interior of a well known company's equivalent amp. It also parallels with no problem. I finally received the 6as7 and a 6080 tubes so i am into the cabinet building. Spray, sand, spray, sand, spray, sand.


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PostPosted: 13 Apr 2014, 19:39 
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Joined: 11 Apr 2014, 18:37
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Got everything all sorted out, ordered parts too.

Last thing I can't seam to get tho, how does the B+ connect to the amp? I expected it to have 2 connection spots, to create a closed loop, but I only see one connection to B+ on the schematic. The heater is easy as it's just in series with the heater plates of the tubes, but the B+ I can't seam to get. Any help would be great! Thanks a bunch!


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PostPosted: 12 May 2014, 20:23 
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Joined: 09 Oct 2012, 19:43
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Location: Vancouver Canada
To be honest with you DutchGFX, (and we have all been where you are at this moment), At this point i would strongly suggest you find someone locally in your area who may know more about electronics as you do now, and ask if they can help a bit to get you started. Perhaps bring a copy of the sch with you to show.
Not knowing where the other end of a LETHAL POTENTIAL of ENERGY is,, is,, a bit over line. You have the need and desire for this craft but you also must respect your own limits and know when to get help. It is of no shame to seek help and you always can use friends with alike interests.


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PostPosted: 13 May 2014, 07:32 
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Joined: 14 Feb 2010, 13:13
Posts: 663
Location: Lisbon, Portugal
Again, I totally agree with laurie54.

Your lack of experience (for now) and building HV devices along with headphones, in my opinion may be a big risk.

Please consider another circuit, if you really want tubes, try a low voltage one.

I guess the 12AU7 and the IRF510 are great, and they run at 24v.

Keep safe my friend! ;)


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PostPosted: 09 Jun 2018, 12:50 
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Joined: 23 May 2018, 21:20
Posts: 1
Hello all! Please excuse me for resurrecting this thread!
I am new to DIY tubes. I have tackled a 12 and 48 volt project and I would like to hear what I'm missing...

I have a question in regards to the power supply schematic. The chokes on the amp and heater are named for their amperage. Would this be the current handling or saturation current?

Thanks in advance! I am slowly learning what everything does but design is beyond me at the moment. Any deviation or ignorance and I've hit a wall. I'm wiring by numbers! :D


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PostPosted: 12 Jun 2018, 18:11 
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Joined: 06 Jun 2008, 18:23
Posts: 4942
Location: Australia
Generally maximum current capability. You should stay well under this limit.

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