[Amps] AMP without HV transceiver

[Hsu]

I just built a "mini" amp, using 8*FU-50(same as Russian GU-50)in push-pull GG, it without HV transformer,
 I add two HV RF  transformers( using  HV and high temprature teflon wire  winded )at  in/out put   port to isolate the  HV.it seems work great.And very cheap and light.But I have never find
 any  commercial produts using simalr design, and few ham design and build   the amp like this.I don't the reason.
Is it duo to safety problem?but I know many old clour TV set with "hot" chassis to, and isolated HV with HV cermic capacitor .
    73! Hsu