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In Reply to: RE: I still have all my parts... posted by Cougar on September 21, 2016 at 07:37:37
Naz
Follow Ups:
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!
That's great, because I'd hate to encourage you into a build you you weren't ready for. For mine, the risk difference between 500V and 1,000 is not as great as one may think as either can kill you. Others will definitely differ on this point and I would not argue but the benefits are worth it IMO.
I know that the OP trannies are expensive but they are also critical and an amp like this deserves decent trannies. What I can attest to is that over the years there's been many an occasion to compare my 845s directly with any number of well respected and some extremely expensive amps of all kinds and nothing (other than one or two of my other SETs) has been remotely close to the clarity, authority, balance, dimensionality and sheer musicality of the 845s and that doesn't just come from me. As such, even though I know there's always better I have not felt the need to even tinker with them for many years.
Anyway, I'm glad that you are have made great progress and if and when you are ready I'm happy to help as much as I can.
Cheers,
Naz
And chassis then I can start the build. I can wait for the output transformers until a later date.
Thank You for the offer, I will surely take you up on it and I may lean on you pretty hard since I'm still learning this high voltage amp thing/s.
I do have the proper work bench now (all wood) and associated gear for the test bench.
I'm really enjoying the build and sound of this VTA-120 amp and can only imagine what a 845 SET amp will sound like. I sill need to finish my two way horn speakers project. These speakers should be a great match for this amp or SET amp.
I will PM you when I get ready to start. Thanks again!
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