EC52--Plate choke--300B/45/2a3/50/EL34 SE

tube-lover · 13th March 2007, 12:14 PM

hi,

any people had comment for this.

thx

thomas

tube-lover · 13th March 2007, 12:18 PM

this tube---

The EC52 is a small transmitting valve from the early days of all glass construction. It was designed for VHF operation, and probably mobile equipment.

The picture shows the............. Flattened oxide coated cathode and the gold grid wire can also be seen.................. The anode is carbonized. The whole electrode assembly takes up less than half of the envelope, and a second valve could be physically fitted into the envelope.

Oh, flattened oxide cathode is large amount of electron emittion & gold grid will better sonic performance.

thx

thomas

phn · 13th March 2007, 12:50 PM

http://www.anc-tv.ne.jp/~suzuki3/amp...52_2a3_amp.htm

AndreasS · 13th March 2007, 02:26 PM

Hard to find this 9-pin loctal sockets

Andreas

tube-lover · 13th March 2007, 05:37 PM

hi AndreasS,

many thanks for your comment.

U right, B9G was not easy to get But I had several hndard on hand. All NOS silver plated & military by British Army.

There will had another method for this tube. Pls take a look for the EC52>> anode choke>>2a3/300B.

Take a look of the bottom of the this anode choke tube kit, very easy to funish.

thx

thomas

tube-lover · 13th March 2007, 05:43 PM

hi Phn,

Your advised circuit I was tested already. I work very well but high impendance IT will not easy to get a very good one. Second was all the sound texture was regarding for the IT.

Looks if I use Anode choke still need cap couple & I can cahnge different brand of coupling cap to change the sound nature.

many thanks

thomas

take a look of the circuit.

phn · 13th March 2007, 06:02 PM

I guess only the Japanese are crazy enough to use ITs as high as 25 and 50k.

The rest of us look for a driver tube with lower Rp.

tube-lover · 13th March 2007, 06:10 PM

hi phn ,

agree your comment be sometimes higher plate resistance tube the MF will higher density than low plate resistance such as 5687 & vocal sound was quite attactive.

thx

thomas

AndreasS · 13th March 2007, 06:57 PM

Hi Thomas,

IMHO the EC52 is a better choice than the C3m (higher max. plate voltage, higher bias).
What are your experience with the DHT EC52 (microphonics, heather hum)?

best regards
Andreas

AndreasS · 13th March 2007, 07:07 PM

sorry, the EC52 is indirectly heatet (I was thinking over DC25)

Andreas

13th March 2007, 12:14 PM	#1
tube-lover diyAudio Member Join Date: Jul 2004 Location: Hong Kong	EC52--Plate choke--300B/45/2a3/50/EL34 SE hi, any people had comment for this. thx thomas

13th March 2007, 07:07 PM	#10
AndreasS diyAudio Member Join Date: May 2005 Location: near Duesseldorf	mistake sorry, the EC52 is indirectly heatet (I was thinking over DC25) Andreas

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13th March 2007, 12:18 PM	#2
tube-lover diyAudio Member Join Date: Jul 2004 Location: Hong Kong	this tube--- The EC52 is a small transmitting valve from the early days of all glass construction. It was designed for VHF operation, and probably mobile equipment. The picture shows the............. Flattened oxide coated cathode and the gold grid wire can also be seen.................. The anode is carbonized. The whole electrode assembly takes up less than half of the envelope, and a second valve could be physically fitted into the envelope. Oh, flattened oxide cathode is large amount of electron emittion & gold grid will better sonic performance. thx thomas

13th March 2007, 12:50 PM	#3
phn diyAudio Member Join Date: Oct 2004	http://www.anc-tv.ne.jp/~suzuki3/amp...52_2a3_amp.htm

13th March 2007, 02:26 PM	#4
AndreasS diyAudio Member Join Date: May 2005 Location: near Duesseldorf	Hard to find this 9-pin loctal sockets Andreas

13th March 2007, 05:37 PM	#5
tube-lover diyAudio Member Join Date: Jul 2004 Location: Hong Kong	hi AndreasS, many thanks for your comment. U right, B9G was not easy to get But I had several hndard on hand. All NOS silver plated & military by British Army. There will had another method for this tube. Pls take a look for the EC52>> anode choke>>2a3/300B. Take a look of the bottom of the this anode choke tube kit, very easy to funish. thx thomas

13th March 2007, 05:43 PM	#6
tube-lover diyAudio Member Join Date: Jul 2004 Location: Hong Kong	hi Phn, Your advised circuit I was tested already. I work very well but high impendance IT will not easy to get a very good one. Second was all the sound texture was regarding for the IT. Looks if I use Anode choke still need cap couple & I can cahnge different brand of coupling cap to change the sound nature. many thanks thomas take a look of the circuit.

13th March 2007, 06:02 PM	#7
phn diyAudio Member Join Date: Oct 2004	I guess only the Japanese are crazy enough to use ITs as high as 25 and 50k. The rest of us look for a driver tube with lower Rp.

13th March 2007, 06:10 PM	#8
tube-lover diyAudio Member Join Date: Jul 2004 Location: Hong Kong	hi phn , agree your comment be sometimes higher plate resistance tube the MF will higher density than low plate resistance such as 5687 & vocal sound was quite attactive. thx thomas

13th March 2007, 06:57 PM	#9
AndreasS diyAudio Member Join Date: May 2005 Location: near Duesseldorf	Hi Thomas, IMHO the EC52 is a better choice than the C3m (higher max. plate voltage, higher bias). What are your experience with the DHT EC52 (microphonics, heather hum)? best regards Andreas

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