Commercial Gainclone kit- building instructions - Page 100

captainobvious · 29th January 2010, 06:48 PM

Thanks Peter.
Just sent you an email.

The speaker impedance loads will be appx 4 ohms each. Parts Express has the 330V 25+25. Will this be acceptable? I dont see any 18+18 or 22+22...

Peter Daniel · 29th January 2010, 07:38 PM

25+25 will work, although with 4ohm speakers lower voltage is really recommended.

captainobvious · 30th January 2010, 02:53 PM

Quote:

Originally Posted by Peter Daniel

25+25 will work, although with 4ohm speakers lower voltage is really recommended.

The closest that Avel makes are these two:

330VA 25+25 (secondary current 6.60A)
250VA 18+18 (secondary current 6.94A)

Unless you know of another supplier that carries something better, which of those two would be more appropriate ?

Peter Daniel · 30th January 2010, 03:36 PM

I would go with 330A 25+25

captainobvious · 3rd February 2010, 06:07 PM

Looks like they are available from AnTek... 400VA 18v+18v

eBay seller "johnango"

For everyone elses reference, its AnTek model number AN-4218. Looks like I'll be ordering those since they would be the better fit.

The eBay link shows the tested specs as well...
18+18V 400VA Toroid Transformer DIY HiFi Audio Amp 4218 - eBay (item 370327724279 end time Feb-05-10 12:56:59 PST)

.

hayenc · 4th February 2010, 12:25 AM

At one point, John was offering diyaudio members a discount below the eBay price if you ordered through his website. This was for the F5. Might send him an email before buying through eBay.

Wavne · 4th February 2010, 07:03 PM

Hey Everyone;
I'm new here. I just ordered the 4780 Dual Mono Kit from Peter. While hunting for transformers I found these guys..Primrose Audio. Has anyone tried these?

I'm planning on getting One and run the kit in stereo until I can afford a second, then run in dual mono. I have a price of $125 CDN after tax and shipping for a single primary 300vac 22+22 secondaries.

regards,

Wayne

j.leger · 5th February 2010, 03:24 AM

Nice find. I wish I had found this outfit a long time ago. Seems a little pricy but nice.

etoiledusoir · 5th February 2010, 11:56 AM

Quote:

Originally Posted by Wavne

Hey Everyone;
I'm new here. I just ordered the 4780 Dual Mono Kit from Peter. While hunting for transformers I found these guys..Primrose Audio. Has anyone tried these?

I'm planning on getting One and run the kit in stereo until I can afford a second, then run in dual mono. I have a price of $125 CDN after tax and shipping for a single primary 300vac 22+22 secondaries.

regards,

Wayne

You can ask Richard if he have surplus stock. I ordered from him two 300va 22-22 for 40$ each about two month ago. Check also for Antek, for more competitive price.

captainobvious · 5th February 2010, 02:57 PM

Regarding isolating the chip from the chassis/chassis mounted heatsink...The kits come with a strip of insualting foil. Do you need to use heatsink thermal compound on both sides of this foil (between foil and chip, and between foil and heatsink) ?

I read through the thread but couldnt find a clear answer on isolating the chip. Thank you.

29th January 2010, 07:38 PM	#992
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	25+25 will work, although with 4ohm speakers lower voltage is really recommended. __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

30th January 2010, 03:36 PM	#994
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	I would go with 330A 25+25 __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

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29th January 2010, 06:48 PM	#991
captainobvious diyAudio Member Join Date: Jul 2008	Thanks Peter. Just sent you an email. The speaker impedance loads will be appx 4 ohms each. Parts Express has the 330V 25+25. Will this be acceptable? I dont see any 18+18 or 22+22...

3rd February 2010, 06:07 PM	#995
captainobvious diyAudio Member Join Date: Jul 2008	Looks like they are available from AnTek... 400VA 18v+18v eBay seller "johnango" For everyone elses reference, its AnTek model number AN-4218. Looks like I'll be ordering those since they would be the better fit. The eBay link shows the tested specs as well... 18+18V 400VA Toroid Transformer DIY HiFi Audio Amp 4218 - eBay (item 370327724279 end time Feb-05-10 12:56:59 PST) .

4th February 2010, 12:25 AM	#996
hayenc diyAudio Member Join Date: Apr 2005 Location: Glendale, AZ	At one point, John was offering diyaudio members a discount below the eBay price if you ordered through his website. This was for the F5. Might send him an email before buying through eBay.

4th February 2010, 07:03 PM	#997
Wavne diyAudio Member Join Date: Oct 2007 Location: Chatham ON	Hey Everyone; I'm new here. I just ordered the 4780 Dual Mono Kit from Peter. While hunting for transformers I found these guys..Primrose Audio. Has anyone tried these? I'm planning on getting One and run the kit in stereo until I can afford a second, then run in dual mono. I have a price of $125 CDN after tax and shipping for a single primary 300vac 22+22 secondaries. regards, Wayne

5th February 2010, 03:24 AM	#998
j.leger diyAudio Member Join Date: Oct 2009 Location: Nanaimo, BC	Nice find. I wish I had found this outfit a long time ago. Seems a little pricy but nice.

5th February 2010, 02:57 PM	#1000
captainobvious diyAudio Member Join Date: Jul 2008	Regarding isolating the chip from the chassis/chassis mounted heatsink...The kits come with a strip of insualting foil. Do you need to use heatsink thermal compound on both sides of this foil (between foil and chip, and between foil and heatsink) ? I read through the thread but couldnt find a clear answer on isolating the chip. Thank you.