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Old 21st May 2012, 08:13 PM   #11
davorin is online now davorin  Croatia
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Quote:
Originally Posted by LAZAROIU View Post
these data will be helpful?

or equivalent to RS1003 is SRS551 find here:

Scheidig Rhrensammlung: Senderoehren: SRS 551 Letztes Update: Sat Jan 10 13:14:01 2009
For RS1003 You can find data sheet at Frank's Electron tube Pages.
RS1003 need 2,3A for heating, SRS551 need 2,2A, and F3a need 2,1A. Other caracteristic are the same.
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Old 21st May 2012, 08:14 PM   #12
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Quote:
Originally Posted by davorin View Post
EF80 is good drive for UL connection output tube, but in triode connection there is much more capacitance (total input capacitance of RS1003~150pF including Miller) , and You need tube with less internal resistance for drive.
Good substitute for EL803(S) is EL83, 6CK6, and cheep russian 6P15S. Also new production (actual) is SV83 (SVETLANA).
Gain of output tube in triode connection is ~20-21x, and for normal input sesitivity (~1Veff) You need drive element with total gain about ~12x(including SHADE feedback). You can use 1/2 double-triode tubes(6SN7, 6CG7, 6FQ7, E80CC etc.; russian 6N6P and 6N30P) and many tubes with single triode in sistem with same caracteristic like 6J5GT.
At first, I try with triode connection E80F(~EF86) and 5879 tubes with very good sounds at low power, but more distorsions at higher levels as triode conection outpui tube. Also try triode connection EL84(6BQ5) and 6BW6(noval version of 6V6). Booth have perfect caracteristic and sound, but too low gain (~6-8x).
You can try 6CL6, caracteristics in triode mode are near EL83, and any video output pentode/tetrode from old B&W-TV sets.
Thank you very much for your response and try 6P15P version or even 6P9 (metal cylinder), do you think would be good and D3a??
I like that these days I'll try this version, thanks!
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Old 21st May 2012, 08:17 PM   #13
davorin is online now davorin  Croatia
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Quote:
Originally Posted by LAZAROIU View Post
Thank you very much for your response and try 6P15P version or even 6P9 (metal cylinder), do you think would be good and D3a??
I like that these days I'll try this version, thanks!
D3a have gain about 70x in triode mode?!
D3a is fantastic tube for many other aplications, but You do not need D3a here!
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Old 21st May 2012, 08:26 PM   #14
davorin is online now davorin  Croatia
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Quote:
Originally Posted by Roger R View Post
Do you have a link to a spec sheet on this tube? Looks pretty interesting.
http://www.mif.pg.gda.pl/homepages/f.../054/4/436.pdf
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Old 21st May 2012, 09:20 PM   #15
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Originally Posted by davorin View Post
.................................................. .................................................. .................................................. .........Good substitute for EL803(S) is EL83, 6CK6, and cheep russian 6P15S. Also .


We made ​​changes in your schedule for 6P15P and the simulation results are excellent.
Thanks for the advice and I hope to be as sound.
The scheme is this:

I prefer UL pentode configuration, I and some power
Attached Images
File Type: png RS1003 atac 6P15P.png (35.8 KB, 739 views)

Last edited by LAZAROIU; 21st May 2012 at 09:24 PM.
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Old 21st May 2012, 09:49 PM   #16
davorin is online now davorin  Croatia
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Quote:
Originally Posted by LAZAROIU View Post
We made ​​changes in your schedule for 6P15P and the simulation results are excellent.
Thanks for the advice and I hope to be as sound.
The scheme is this:

I prefer UL pentode configuration, I and some power
If You need more power, You can drop katode resistor to 90 Ohms (2x180 Ohms), and katode curent wil grow to 160-165mA, and outpu power to >25W!
At my experiments, I started with 220+150 Ohms in paralel (89 Ohms), and katode curent was 170mA, and output power ~28W!
RS1003 (SRS551 also!) is very robust and constructed for >10000 working hours with 60W plate, and 9W screen disipation! Usualy used in medical instruments (HF-heating), and FM-transmitters (as output tube, and drive tube for stronger transmitters). F3a tubes SIEMENS and TELEFUNKEN produced for German-Post broadband multichanell telefone HF amplifier CCS use.
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Old 22nd May 2012, 01:15 AM   #17
davorin is online now davorin  Croatia
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Some pictures from begining:
Attached Images
File Type: jpg 001a.jpg (190.7 KB, 668 views)
File Type: jpg 051a.jpg (171.6 KB, 613 views)
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File Type: jpg 006a.jpg (142.9 KB, 111 views)
File Type: jpg 016a.jpg (150.9 KB, 148 views)
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Old 22nd May 2012, 11:55 AM   #18
davorin is online now davorin  Croatia
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Output tansformer in this amp. (air gap is 0,40mm):
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File Type: jpg OT-SE-40W-2,4kHz.jpg (207.0 KB, 381 views)
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Old 22nd May 2012, 01:41 PM   #19
vtr is offline vtr  Switzerland
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Default great project!

interesting high low switch.

i experimented some years ago with triode pp rs1003 and stopped the project because of partial glowing g2 grid, current was in the range. it stoped only with g2 below 300v- do you have the same issue?
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Old 22nd May 2012, 02:07 PM   #20
davorin is online now davorin  Croatia
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Quote:
Originally Posted by vtr View Post
interesting high low switch.

i experimented some years ago with triode pp rs1003 and stopped the project because of partial glowing g2 grid, current was in the range. it stoped only with g2 below 300v- do you have the same issue?
Lights (dark red) from center inside tube is NORMAL for RS1003 tube! No problem with screen voltage over 500V! I must use grid stopers with ferite-pearl for G1 and G2 to prevent oscilations in HF (VHF, UHF, etc.) region, because tube have very high Gm!
Now, I am testing RS1003 in experimental PP amp with Ua=900V and UG2=450V, and have no problem (Pout>200W!).

Last edited by davorin; 22nd May 2012 at 02:28 PM.
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