4P1L in parallel Single Ended - diyAudio
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Old 19th September 2014, 03:03 AM   #1
aldovan is offline aldovan  Brazil
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Talking 4P1L in parallel Single Ended

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This amplifier prototype play two 4P1L in parallel single ended.
The sound is very detailed. Output transformer is a DIY 2K5 ohms.
Plate voltage is 200V and 25mA per 4P1L. Coupling capacitor is a Russian K40Y-9.
The sound is very detailed, see the video

https://www.youtube.com/watch?v=sDny...ature=youtu.be


Aldovan
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Old 19th September 2014, 03:26 AM   #2
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Your video is totally useless. Can you please show us a schematic, or the actual amp?
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Old 19th September 2014, 04:04 AM   #3
aldovan is offline aldovan  Brazil
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Quote:
Originally Posted by mcandmar View Post
Your video is totally useless. Can you please show us a schematic, or the actual amp?

This is a prototype, not a final amplifier, the prototype is ugly, have only a lot of wire and the components.
I need draw the schematic, I build of my mind.
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Old 19th September 2014, 04:52 AM   #4
hooman is offline hooman  Iran
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Quote:
Originally Posted by aldovan View Post
This is a prototype, not a final amplifier, the prototype is ugly, have only a lot of wire and the components.
I need draw the schematic, I build of my mind.
technical people who want to know what you did need schematic .
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Old 19th September 2014, 04:54 AM   #5
aldovan is offline aldovan  Brazil
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Default new video

Can you see this video ?

https://www.youtube.com/watch?v=b-z6ojaulzw
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Old 19th September 2014, 04:56 AM   #6
aldovan is offline aldovan  Brazil
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Quote:
Originally Posted by hooman View Post
technical people who want to know what you did need schematic .
Yes, this is true, I will draw the circuit...
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Old 19th September 2014, 04:56 AM   #7
AJT is offline AJT  Philippines
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can you post your schematics? i am making one myself now....thanks..

i am targetting 250 volts plate and 60mA for two tubes in parallel,
this way it is easy to compare with a 2A3 set that i did several years back..
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the best advertisement for a good audio design is the number of diy'ers wanting to build it after all the years....never the say so of so called gurus....
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Old 19th September 2014, 05:23 AM   #8
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Utterly useless video. What's the point of showing a video of a speaker cone when the main concern is the amp?

A schematic is much appreciated.
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Old 19th September 2014, 09:43 AM   #9
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Hello!
Maybe someone is interested SPICE tube model 4P1L pentoda.
I think you can easily design a schematic and then went into practice ...

***************************************
*4P1L UG2=150V
*Vp_MAX=270.0 Ip_MAX=0.12 7 0 1MEG
SUBCKT PENT_4P1L_2 1 2 3 4 ; P G K G2
+
PARAMS: CCG=3P CGP=1.4P CCP=1.9P RGI=2000
+ MU=11.808 EX=1.4 KG1=1210.0 KG2=4500.0 KP=43.2 KVB=32.4
DUMMY SO NODE 7 HAS 2 CONNECTIONS
E1 7 0 VALUE= ;
E1 BREAKS UP LONG EQUATION FOR G1.
+{V(4,3)/KP*LOG(1+EXP((1/MU+V(2,3)/V(4,3))*KP))}
G1
1 3 VALUE={(PWR(V(7),EX)+PWRS(V(7),EX))/KG1*ATAN(V(1,3)/KVB)}
G2
4 3 VALUE={(EXP(EX*(LOG((V(4,3)/MU)+V(2,3)))))/KG2}
RCP
1 3 1G ; FOR CONVERGENCE
C1
2 3 {CCG} ; CATHODE-GRID 1
C2
1 2 {CPG1} ; GRID 1-PLATE
C3
1 3 {CCP} ; CATHODE-PLATE
R1
2 5 {RGI} ; FOR GRID CURRENT
D3
5 3 DX ; FOR GRID CURRENT
.MODEL DX D(IS=1N RS=1 CJO=10PF TT=1N)

.ENDS

***************************************
Attached Images
File Type: png MODEL 4P1L .png (48.6 KB, 249 views)
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Old 19th September 2014, 10:15 AM   #10
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I propose a theoretical project 2x4P1L performance parallel configuration is attached
Attached Images
File Type: png SE 4P1L PARALE .png (57.8 KB, 254 views)

Last edited by LAZAROIU; 19th September 2014 at 10:17 AM.
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