6P41s vs 7868 - Page 3

davorin · 9th February 2018, 09:29 PM

Quote:

Originally Posted by Kay Pirinha

Are there available any datasheets for these 6P41S? Frank doesn't appear to have them handy...
Best regards!

Original files:

Some curves:

Kay Pirinha · 10th February 2018, 09:03 AM

Quote:

Originally Posted by davorin

Some curves:

Thanks, Davorin!

Now I'm about to find someone to teach me the Russian language

.

Best regards!

artosalo · 04:25 PM

Quote:

I intend to try the 6P41s some time to see what I can squeeze out of them.

I done some tests with 6P41S as a PP-amplifier. Here are results with 40% UL, triode connected and pentode connected with different operating conditions.
Attached is also the schematic of the test circuit. All measurements were done without GNFB.

huggygood · 10th February 2018, 04:33 PM

good ! i have a pair of hammond 1560 in my stock

huggygood · 14th February 2018, 10:14 AM

i received my 7591 quad
I'm waiting for my octal socket
to be continued ...

cags · 2nd March 2018, 10:01 PM

Hello Toprepairman,
I am in process of a total restoration to convert Rowe R-4359 amp to use as a stand alone audio amp for my sound system. Am searching for parts list and schematics. I have come across of schematic by secret4mula but not clearly readable. Any info you can assist me with will be greatly appreciated. Would you know the manufacturer of the output trannies? Thanks again .

Regards,
Joe

toprepairman · 4th March 2018, 01:05 PM

Hi Joe.
Like you I only found a poorish copy on the net and then redrew it by hand.
I really don't know who made the transformers. I have stripped out the surplus wiring with the relay etc, with a view to converting to a straightforward stereo amp.
I got a set of 6P41's but they don't really perform as the originals so I may remove the bases and fit octals to run with 6L6/5881 type valves.
I'm not sure when I'll get round to doing this as I have another, bigger, more pressing project on the go in the shape of a house rebuild. Currently I'm looking at a big hole in the ground with a load of concrete in it. Behind is a huge pile of clay that came out of the hole so this is taking priority just now.
Henry

Charm · 01:42 PM

Quote:

Originally Posted by Kay Pirinha

Thanks, Davorin!
Now I'm about to find someone to teach me the Russian language

.

Intelligence reported, the analog is EL508, PL508..

huggygood · 16th April 2018, 05:53 AM

I just picked a ami-rowe 4359A

but with missing preamp

and missing tubes ...

huggygood · 1st May 2018, 08:01 AM

ok,the 6p41s are definitely different to 7591/7868
on my AMI-ROWE r4359, I got to get -70vdc for bias and+ 380vdc for a supply voltage and it's still not good,
the 6p41s do not work long at this voltage.
I start the conversion for 7591.
I keep the 6p41s for a future low voltage amp
end of episode 6p41s

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10th February 2018, 04:33 PM	#24
huggygood diyAudio Member Join Date: Mar 2011 Location: france (bretagne)	good ! i have a pair of hammond 1560 in my stock

14th February 2018, 10:14 AM	#25
huggygood diyAudio Member Join Date: Mar 2011 Location: france (bretagne)	i received my 7591 quad I'm waiting for my octal socket to be continued ...

2nd March 2018, 10:01 PM	#26
cags diyAudio Member Join Date: Nov 2010	Hello Toprepairman, I am in process of a total restoration to convert Rowe R-4359 amp to use as a stand alone audio amp for my sound system. Am searching for parts list and schematics. I have come across of schematic by secret4mula but not clearly readable. Any info you can assist me with will be greatly appreciated. Would you know the manufacturer of the output trannies? Thanks again . Regards, Joe

4th March 2018, 01:05 PM	#27
toprepairman diyAudio Member Join Date: Nov 2010	Hi Joe. Like you I only found a poorish copy on the net and then redrew it by hand. I really don't know who made the transformers. I have stripped out the surplus wiring with the relay etc, with a view to converting to a straightforward stereo amp. I got a set of 6P41's but they don't really perform as the originals so I may remove the bases and fit octals to run with 6L6/5881 type valves. I'm not sure when I'll get round to doing this as I have another, bigger, more pressing project on the go in the shape of a house rebuild. Currently I'm looking at a big hole in the ground with a load of concrete in it. Behind is a huge pile of clay that came out of the hole so this is taking priority just now. Henry

16th April 2018, 05:53 AM	#29
huggygood diyAudio Member Join Date: Mar 2011 Location: france (bretagne)	I just picked a ami-rowe 4359A but with missing preamp and missing tubes ...

1st May 2018, 08:01 AM	#30
huggygood diyAudio Member Join Date: Mar 2011 Location: france (bretagne)	ok,the 6p41s are definitely different to 7591/7868 on my AMI-ROWE r4359, I got to get -70vdc for bias and+ 380vdc for a supply voltage and it's still not good, the 6p41s do not work long at this voltage. I start the conversion for 7591. I keep the 6p41s for a future low voltage amp end of episode 6p41s