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zkit1 alternative power transformer UK Mullard (Read 890 times)
otookey
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zkit1 alternative power transformer UK Mullard
03/08/23 at 17:05:28
 
Hi all. Newbie here. I want to build the zkit1, but the edcor power transformer is almost £300 including shipping in the uk. I found a cheaper Mullard transformer, but it’s 5V secondary is 2A rather than 3A of the recommended edcor. Does the amp even use the 5V tap? Can I use the Mullard safely? They are available at Primary Windings, model Mullard 5-10 Stereo.
I also want to use these toroidal OTs. Are they suitable?
Toroidy TTG-EL84SE

Thank you.
Ollie.
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Mannytheseacow
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Re: zkit1 alternative power transformer UK Mullard
Reply #1 - 03/10/23 at 13:51:52
 
I believe that Mullard transformer would work. The 5v lead is for a tube rectifier, which isn’t used in the zkit.
I can’t say for sure about the toroidals… they are far enough out of spec that I wouldn’t be comfortable using them but they may work.
Let us know how it turns out.
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otookey
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Re: zkit1 alternative power transformer UK Mullard
Reply #2 - 03/10/23 at 19:30:18
 
Thanks for your reply. Somebody else on the forums has used the toroids and didn’t report any problems. I also found a seller on eBay from Greece who makes transformers for the zkit1. Has anyone used the eBay ones?
Thanks

P.S I don’t know why this posted is in the important forum rather than in the board one!
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JBzen
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Re: zkit1 alternative power transformer UK Mullard
Reply #3 - 03/17/23 at 13:34:59
 
By the nature of toroidal reactions in a circuit there might be issues with voltage swings especially on low frequency’s. I would avoid using those as output trannies in a single ended application.

I did look at the Greece offerings. Was considering a order but had a change in game plan when others showed up on e-bay. Look to be good custom output trannies at a fair price. Just have to wait for them.

My2
John
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