I'm ready to go start that 845 amp build now

Posted by Cougar (A) on September 22, 2016 at 15:16:16

In Reply to: They do indeed sound heavenly (nt) posted by Naz on September 22, 2016 at 05:19:24:

Hi Naz, I just finished my Bob Latino VTA-120 kit so I finally got my little experience with building a tube amp from a kit. Now I'm ready to take on that 845 project you and I were discussion a few years back with that schematic for the 845 amps with 1000vdc. :)

I learned a lot from this build. One was to pre-clean and pre-tin all leads. I found out the hard way that the wire that was supplied was pre-tinned but it melted at a different temperature than the solder I was using so there was two cold solder joints on the heater lines going into the pcb.

I used a Chop stick to probe/poke around since the solder joints looked shinny and good. The chop stick works very well as I found the bad joints really fast without having to stick my hand in the unit since there is 500vdc. After using a magnifying glass I saw what the joint really looked like, the solder flowed nicely all around the wire but never melted together. So the VTA-120 is up and running and sound really nice.

I still have all my parts for the 845 amp build and will be looking into some output transformers for this build. These output transformers are expensive!

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Follow Ups Full Thread

Topic - Anyone built or heard an Alley Oop amp? - vinnie2 07:43:54 09/18/16 (19)

At 500Vdc the output of the 845's should be..... - Cougar 21:10:20 09/20/16 (6)

RE: At 500Vdc the output of the 845's should be..... - vinnie2 03:11:20 09/21/16 (5)

I still have all my parts... - Cougar 07:37:37 09/21/16 (4)

They do indeed sound heavenly (nt) - Naz 05:19:24 09/22/16 (3)

I'm ready to go start that 845 amp build now - Cougar 15:16:16 09/22/16 (2)

RE: I'm ready to go start that 845 amp build now - Naz 16:15:07 09/22/16 (1)

I just need to get the high voltage wire.... - Cougar 23:44:30 09/22/16 (0)

RE: Anyone built or heard an Alley Oop amp? - Ivan303 14:05:09 09/18/16 (1)

RE: Anyone built or heard an Alley Oop amp? - vinnie2 15:33:33 09/18/16 (0)

RE: hmmmmm - vinnie2 13:48:07 09/18/16 (9)

RE: hmmmmm - drummerwill 21:11:52 09/18/16 (8)

RE: hmmmmm - vinnie2 04:49:54 09/19/16 (6)

RE: hmmmmm ...here's a thought .. - drummerwill 12:29:25 09/19/16 (5)

RE: hmmmmm ...here's a thought .. - vinnie2 15:06:16 09/19/16 (4)

RE: hmmmmm ...here's a thought .. Well vinnie.. - drummerwill 15:44:56 09/19/16 (3)

RE: hmmmmm ...here's a thought .. Well vinnie.. - vinnie2 17:09:26 09/19/16 (2)

RE: hmmmmm ...here's a thought .. Well vinnie.. - drummerwill 19:02:29 09/19/16 (1)

RE: hmmmmm ...here's a thought .. Well vinnie.. - vinnie2 04:48:53 09/20/16 (0)

RE: hmmmmm .... Oh yeah .... - drummerwill 21:15:01 09/18/16 (0)

Follow Ups

I'm ready to go start that 845 amp build now - Cougar 15:16:16 09/22/16 (2)

RE: I'm ready to go start that 845 amp build now - Naz 16:15:07 09/22/16 (1)

I just need to get the high voltage wire.... - Cougar 23:44:30 09/22/16 (0)

I'm ready to go start that 845 amp build now

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