Author Topic: 13E1 datasheet  (Read 4659 times)

kheper

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13E1 datasheet
« on: March 15, 2010, 08:49:43 PM »
Below is the attached datasheet for the 13E1. To those on this forum, I do not know if it qualifies as a legitimate "boatanchor" tube. However, it has a 90W max plate dissipation, and it can be driven by "modest" voltages in the range of 350-450Vdc to produce about 16W in triode mode and 25W in UL mode.

http://www.turneraudio.com.au/MonoblocSE25.htm

Turner comments on the 13E1 in triode, UL and tetrode modes:

"it has an Ra of only 300ohms, and it will generate a very sounding nice 16 watts into 1.5kohms."

"I found that the screen could be connected to a tap on the OPT primary at 66% of the turns and there was negligible increase in the complexity of THD spectra compared to triode, where the THD consisted almost entirely of 2H. 33% taps were too similar to tetrode. So I settled on the 66% UL tap for the 13E1, and got up to about 27 watts instead of only 16 watts with triode, but because Ra with 66% UL is 600 ohms, some global NFB was essential to keep the output resistance of the amp low for a good damping factor."

"In pure tetrode the tube is not very linear and generates a large array of harmonics even at a few watts. It is not suited to SE use in pure tetrode, ie, with a fixed screen voltage. But when the screen is connected to the anode to make the tube work like a triode the linearity is no worse than many other large genuine triodes"


Bas Horneman

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Re: 13E1 datasheet
« Reply #1 on: March 16, 2010, 11:40:03 AM »
A very interesting tube...so many tubes so little time and money :)

ANSA

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Re: 13E1 datasheet
« Reply #2 on: March 17, 2010, 04:59:53 PM »
Some characteristics of the 13E1 remind me the 7242, that it could be a viable alternative:
http://www.mif.pg.gda.pl/homepages/frank/sheets/127/7/7242.pdf

However I believe that this kind of tube is more suitable for use in PP.

Bas Horneman

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Re: 13E1 datasheet
« Reply #3 on: March 17, 2010, 05:46:58 PM »
Wow that 7242 tube is even more expensive than the 13E1. Found one for 406,64 €  :o

ANSA

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Re: 13E1 datasheet
« Reply #4 on: March 18, 2010, 06:34:09 PM »
Yes, the 7424 is rare and expensive.

The 7424 tube has a structure similar to the 13E1 one, i.e it's formed by a plate with various cathode+plate groups inside.
Regarding the 7242s, this shape is very important because taking into account the electric characteristics of a single group (cathode+grid+plate), we find out that they match perfectly one of the triode contained in the 6528.

http://www.mif.pg.gda.pl/homepages/frank/sheets/077/6/6528A.pdf

7242 Gm = 111mA/V
111 : 3 = 37
6528 Gm = 37mA/V per section

7242 mu = 9
6528 mu = 9

7242 Heater 6.3V, 7.5A (2.5A per section)
6528 Heater 6.3V, 5A (2.5A per section)

ANSA

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Re: 13E1 datasheet
« Reply #5 on: March 19, 2010, 12:06:22 AM »

To clarify ... the common points between 7242 and 6528, may result in the following equation:

http://ansaht.altervista.org/uv638jed4/Amp1/7242-6528.jpg


Bas Horneman

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Re: 13E1 datasheet
« Reply #6 on: March 19, 2010, 10:31:53 AM »
For some vague reason I can't see your jpg if I click on the link.
Therefore I have attached it here.