comments on my finished power humpty

karma · 13th August 2004, 08:44 PM

finished at last. 16volts with secondarys. for briansgt's gainclone

look good?

even at 16v the gainclone has lots of power. and sounds a little bit smoother. and without that pop when u turn it on

i used cat5 cable 2 wires per rail tested it and its safe even when u short it. wires dont heat up.

front

karma · 13th August 2004, 08:48 PM

back and i forgot the transformer is only 56.2va and after a few hours it stays cool to the touch.

back is still wet

carlosfm · 13th August 2004, 10:07 PM

Quite

.
But you can call it... Power Ungry.

analog_sa · 13th August 2004, 10:08 PM

Quote:

look good?

Stunning!!!! An amazing example of craftsmanship.

karma · 13th August 2004, 10:57 PM

wasnt the original or first gaincard 12v? i have used 25v and 30v
with this amp and i find it sounds better with 16v. ahh i likely need
another

hehehe

thanks guys

carlosfm · 13th August 2004, 11:36 PM

Quote:

Originally posted by karma
wasnt the original or first gaincard 12v?

No.
The fist Gaincard had (has) 25w, uses the LM1875, and with this (claimed) power and this chip it doesn't work at 16v for sure.

BlackDog · 14th August 2004, 02:06 AM

Quote:

Originally posted by karma

i used cat5 cable 2 wires per rail tested it and its safe even when u short it. wires dont heat up.

I also used similar wiring for my amp. When running the amp flat out into a load resistor, I measured a 10mV voltage drop across the the cat 5 cable pair. - Certainly nothing to be concerned about!

SteveM

karma · 14th August 2004, 06:42 AM

Quote:

Originally posted by carlosfm

No.
The fist Gaincard had (has) 25w, uses the LM1875, and with this (claimed) power and this chip it doesn't work at 16v for sure.

hehehe i was just playing the real rail voltage from the humpty is
22.1v but it would be nice if it could

KT · 17th August 2004, 02:02 PM

Carlos,

Are you sure the original 25 watt Gainclone uses the LM1875? At 25 watts, it would seem to make sense.

The 50 watt Gainclone then uses the LM3875?

I'm uncertain because I was told by Yoshi Segoshi that the newer Shigaraki amp uses a different chip from the original 4707 Gaincard, and that this different chip is one that sounds smoother and more listenable. Turns out that it was the LM1875 in the Shigaraki.

Of course, I don't know if he was referring to the the 50 or 25 watt of the Gaincard in this comparison, but I always thought the original used the LM3875.

KT

UrSv · 17th August 2004, 02:16 PM

Original Gainclone might be misleading...

I thought the original amplifier called the Gaincard existed in two flavours namely 25 W and 50 W both using the LM3875. The difference was power supply voltage. Later came the Shigaraki which indeed uses LM1875.

17th August 2004, 02:16 PM	#10
UrSv diyAudio Member Join Date: Jan 2002 Location: Sweden	Original Gainclone might be misleading... I thought the original amplifier called the Gaincard existed in two flavours namely 25 W and 50 W both using the LM3875. The difference was power supply voltage. Later came the Shigaraki which indeed uses LM1875. __________________ UrSv Those who say it can't be done should not stop those who are doing it.

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13th August 2004, 10:07 PM	#3
carlosfm Banned Join Date: Mar 2003 Location: Lisbon, Portugal	Quite . But you can call it... Power Ungry.

13th August 2004, 10:57 PM	#5
karma diyAudio Member Join Date: Feb 2003 Location: hamilton,ontario	wasnt the original or first gaincard 12v? i have used 25v and 30v with this amp and i find it sounds better with 16v. ahh i likely need another hehehe thanks guys

17th August 2004, 02:02 PM	#9
KT diyAudio Member Join Date: Oct 2003 Location: USA	Carlos, Are you sure the original 25 watt Gainclone uses the LM1875? At 25 watts, it would seem to make sense. The 50 watt Gainclone then uses the LM3875? I'm uncertain because I was told by Yoshi Segoshi that the newer Shigaraki amp uses a different chip from the original 4707 Gaincard, and that this different chip is one that sounds smoother and more listenable. Turns out that it was the LM1875 in the Shigaraki. Of course, I don't know if he was referring to the the 50 or 25 watt of the Gaincard in this comparison, but I always thought the original used the LM3875. KT

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