Has anyone tried 2 x 6550 100W amp?

calico88 · 28th January 2007, 03:59 AM

base on the 'principles of power' book by kevin o'conner, there is one schematic just using 2x6550 tubes & 1x12AX7 output 100W !

is this possibe??

anyone try this ?

cal

mississippi · 28th January 2007, 11:27 AM

I do not have the schematic diagram of your amplifier, but I can get out of 2 x EL34 and an ecc82 100 watts with 900 Volts on the anode and -39V on G1. (possible with Philips and Telefunken tubes).

SY · 28th January 2007, 11:52 AM

Yes, it's possible. Take a look at the 6550A datasheet. As it happens, I've got a 6550-based amp on hand which puts out 100W (it's an Ampex), running the output stage in pentode with about 520V on the plates and a 2200 ohm plate to plate load.

calico88 · 28th January 2007, 11:54 AM

how the h....you do with EL34 100W ??
the noise must be loud ? how is the sound?

have you try 2x 6550 100W on that book?

I just want to built 60w-100w amp with minimum cost!
any reccomendation? how about that 2x6550 schematic?

cal

Original Burnedfingers · 28th January 2007, 12:02 PM

SY

I would like to see a schematic of the Ampex or better yet please send it to me and I will give it a nice home.

SY · 28th January 2007, 12:02 PM

Quote:

how the h....you do with EL34 100W ??

As usual, the datasheet tells all. 11k plate to plate, 750V on the plates, 400V on the screens.

SY · 28th January 2007, 12:05 PM

Quote:

Originally posted by burnedfingers
SY

I would like to see a schematic of the Ampex or better yet please send it to me and I will give it a nice home.

I'd like to see it myself. I can't locate any info about this amp.

From what I understand, Ampex power amps are collectors' items; I wish I knew that before I disassembled the twin of this amp to provide iron and chassis for my big triode amp. I'm tempted to eBay the intact one.

Original Burnedfingers · 28th January 2007, 12:11 PM

SY

With your skill you could probably draw up a schematic in about 2 min or less.

If your thinking about ebaying it ...please consider your friends here first.

Giaime · 28th January 2007, 12:13 PM

I have here an 80W 2x6550 amp. I don't have a schematic, don't know the load of the output tubes. It runs the 6550 with 570V on the anode and 320V (regulated) on the screens. ~2000uF total PSU capacitance

It uses a 12pin triple triode for the audio path, the first two ones are cascaded, the last one is a cathodyne phase splitter.

An horrible circuit that sounds good

PS the 12pin triode/pentode is (I think) used as a regulator for the input stage. The screens have their own solid state one.

mississippi · 28th January 2007, 12:21 PM

The sound of an EL34 is very good.
I also buils an amplifier with an output of 1200 watts only with EL34's.
I already put a link of this amplifier (foto's and schema) in another topic of this forum.

28th January 2007, 03:59 AM	#1
calico88 diyAudio Member Join Date: Mar 2006 Location: sdf	does anyone try 2x6550 100w amp ? base on the 'principles of power' book by kevin o'conner, there is one schematic just using 2x6550 tubes & 1x12AX7 output 100W ! is this possibe?? anyone try this ? cal __________________ be tube

28th January 2007, 11:52 AM	#3
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	Yes, it's possible. Take a look at the 6550A datasheet. As it happens, I've got a 6550-based amp on hand which puts out 100W (it's an Ampex), running the output stage in pentode with about 520V on the plates and a 2200 ohm plate to plate load. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

28th January 2007, 11:54 AM	#4
calico88 diyAudio Member Join Date: Mar 2006 Location: sdf	how the h....you do with EL34 100W ?? the noise must be loud ? how is the sound? have you try 2x 6550 100W on that book? I just want to built 60w-100w amp with minimum cost! any reccomendation? how about that 2x6550 schematic? cal __________________ be tube

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28th January 2007, 11:27 AM	#2
mississippi diyAudio Member Join Date: Apr 2006 Location: holland	I do not have the schematic diagram of your amplifier, but I can get out of 2 x EL34 and an ecc82 100 watts with 900 Volts on the anode and -39V on G1. (possible with Philips and Telefunken tubes).

28th January 2007, 12:02 PM	#5
Original Burnedfingers diyAudio Member Join Date: Nov 2002	SY I would like to see a schematic of the Ampex or better yet please send it to me and I will give it a nice home.

28th January 2007, 12:11 PM	#8
Original Burnedfingers diyAudio Member Join Date: Nov 2002	SY With your skill you could probably draw up a schematic in about 2 min or less. If your thinking about ebaying it ...please consider your friends here first.

28th January 2007, 12:13 PM	#9
Giaime diyAudio Member Join Date: Oct 2004	I have here an 80W 2x6550 amp. I don't have a schematic, don't know the load of the output tubes. It runs the 6550 with 570V on the anode and 320V (regulated) on the screens. ~2000uF total PSU capacitance It uses a 12pin triple triode for the audio path, the first two ones are cascaded, the last one is a cathodyne phase splitter. An horrible circuit that sounds good PS the 12pin triode/pentode is (I think) used as a regulator for the input stage. The screens have their own solid state one.

28th January 2007, 12:21 PM	#10
mississippi diyAudio Member Join Date: Apr 2006 Location: holland	The sound of an EL34 is very good. I also buils an amplifier with an output of 1200 watts only with EL34's. I already put a link of this amplifier (foto's and schema) in another topic of this forum.

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