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SUPPORT FORUMS FOR ZKITS >> ZKIT 1 Support forum >> zkit1 alternative power transformer UK Mullard
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Message started by otookey on 03/08/23 at 17:05:28

Title: zkit1 alternative power transformer UK Mullard
Post by otookey on 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.

Title: Re: zkit1 alternative power transformer UK Mullard
Post by Mannytheseacow on 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.

Title: Re: zkit1 alternative power transformer UK Mullard
Post by otookey on 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!

Title: Re: zkit1 alternative power transformer UK Mullard
Post by JBzen on 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