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EL34 or 6L6g
EL34 or 6L6g
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Old 12th February 2019, 10:50 PM   #11
multi is offline multi  Australia
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GUNFU
"300B unnecessarily expensive, or rather, they are artificially inflated demand. If you want to use direct-glow radiators, a good solution is the 811A, as well as the Russian and Chinese counterparts. 811 is a feature, they are the right characteristics and require a thoughtful driver, and there are also a lot of ready-made circuits for them."

I have made many Push pull 811a amps 100 watts at 600 volts 40 watts class A. can be used down to 450v 2k-5 k transformer sound wonderful, but you need some feedback. Or altec/515 or JBL speakers Just my preference but did not like single ended sound with 811A
Have circuits.
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Old 12th February 2019, 11:53 PM   #12
dtaylo3 is offline dtaylo3  United States
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How about KT88 or KT90, 120 or 150? Check out this video series: kt88 single ended tube amplifier build 2018 - part 1
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Old 13th February 2019, 12:00 AM   #13
kodabmx is offline kodabmx  Canada
Affordable triode connected sweep tube amps.
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EL34 or 6L6g
Triode connected sweep tubes... Like EL519...
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Old 13th February 2019, 12:06 AM   #14
H713 is offline H713  United States
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Quote:
Originally Posted by azazello View Post
Cheep tubes, cheep sound....better expensive sound, than cheep...
I don't necessarily agree with you. Many awesome amps have been built around the 6L6GC, EL34, KT88 etc.

The design of the amplifier has a bigger impact than the individual tubes used. Beyond that, I've seen plenty of 300B amps using poor designs and $40 output transformers.

I'm still going to recommend a PP EL84. As for SE, the 811 looks like a good choice. Parallel 6L6GC is an excellent choice as well... careful about oscillation though. I've found that parallel 6L6s have a nasty habit of oscillating at HF frequencies. They do make nice transmitting tubes after all.
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Old 13th February 2019, 06:13 AM   #15
GUNFU is offline GUNFU  Russian Federation
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Click the image to open in full size.

GOTHAM PFB-150WA Power Amplifier YouTube
One of the best studio amplifiers for cutting master discs of varnish. Where is the cheap sound here? Yes, feedback is necessary, but unlike the 300B on the 811A, you can tune the optimal internal resistance with minimum distortion, analogy with the UL D.Hafler circuit or as in the partial feedback circuit, telefunken V69 and neumann LV60.
And now show me an example of using 300B not in movie theaters, but in recording studios. )))

Last edited by GUNFU; 13th February 2019 at 06:43 AM.
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Old 13th February 2019, 07:17 AM   #16
multi is offline multi  Australia
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I have built lots of these record cutting amplifiers Leaving out the.record cutting audio stages.
The sound is wonderful can drive any speakers; you would never use 6550/KT88 compared to the 811A GOTHAM PFB-150WA Power .Recently I built one with a Toriody output transformer
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Old 13th February 2019, 07:22 AM   #17
multi is offline multi  Australia
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The original 811A GOTHAM PFB-150WA Power used toriod out put transformers.
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Old 13th February 2019, 07:29 AM   #18
GUNFU is offline GUNFU  Russian Federation
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Quote:
Originally Posted by multi View Post
I have built lots of these record cutting amplifiers Leaving out the.record cutting audio stages.
The sound is wonderful can drive any speakers; you would never use 6550/KT88 compared to the 811A GOTHAM PFB-150WA Power .Recently I built one with a Toriody output transformer
Click the image to open in full size.

Our company can manufacture you an output toroidal transformer not only from silicon steel but also on amorphous alloy.
Moreover, we can produce exclusively for your requirements, and without the need for switching versatility for different tubes in this case, as in that original transformer General Radio 942-A http://www.ietlabs.com/pdf/Manuals/G...ransformer.pdf

Last edited by GUNFU; 13th February 2019 at 07:48 AM.
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Old 13th February 2019, 07:55 AM   #19
6A3sUMMER is offline 6A3sUMMER  United States
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santitruco,

It seems there are no end to suggestions. Most or all of them are really good ideas.

But back to your original post, what do you want most?

Low distortion? Single Ended? 10 Watts? 6L6G or EL34? Willing to use a higher wattage tube, or to parallel two of the above tubes to get the power with SE? Less than 10 Watts would be OK? Push Pull with 6L6G or EL34; or with other tubes, EL84, or etc.?

Parallel SE is OK when designed and implemented properly. I was one of the authors of Parallel Tubes Effects in Glass Audio. We made 600 measurements, had 3 listening Venues (double blindfold listening tests), Math proofs, and more.

Last edited by 6A3sUMMER; 13th February 2019 at 08:02 AM.
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Old 13th February 2019, 10:08 AM   #20
Kay Pirinha is offline Kay Pirinha  Germany
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Quote:
Originally Posted by azazello View Post
Using EL34, You will have no more 4-5 W clear sound. 10 W is not serious for HiEnd, and sound will be sharp and distorted /EL34, 6L6 are, IMO, for guitar amps/. Better choice is 300B, that will give You real 6-7 W with clear, warm sound and deep and detail sounding. /using FB will press the scene of sound/.
Quote:
Originally Posted by azazello View Post
Cheep tubes, cheep sound....better expensive sound, than cheep...
Quite some bold statements, aren't they? I'm sure you want to substantiate them .
Best regards!
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Last edited by Cal Weldon; 16th February 2019 at 03:41 PM. Reason: removed collateral
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