One more point. The Chartlize and some Class T amp give a lod start up
POP for some high efficiency speakers when switched on. This is surely
not a good thing. To solve this problem, use a 3 positions
selector/switch at the low volt (12V) rail for on/off switch. Connect
the + rail to one position via a 300Ohm 2w resistor in series forming
a soft-start position mode. The other position to the + rail direct so
that you can start up using the position with the series resistor as
soft start and then urn to the directly connected to + rail position
as fully started mode. This solve the start up pop.

--- In doctorjohn_CheapTubeAudio@yahoogroups.com, "andy2667"
<andy2667@s...> wrote:
>
> Hello Thomas,
>
> Welcome to the Charlize user group. Let the Charlize to run in
> 50~100hrs and the sound will improve a lot. However, you need to have
> high efficiency and easy loading speakers as the amp only have good
> 8w. No need to build a regulated PSU. Driving the Charlize by Switch
> Mode PSU (SMPS) or SLA battery will be better. Remove the cap to add
> across the PSU rail. This will impede the dynamic & rythmic characters
> of the Charlize. Try it!.
>
> SMPS & SLA battery are cheap in HK. So please try them and compare.
> For your information, a 12V 5A SMPS cost less than HK$200. A 9AH 12V
> SLA battery is approx. HK$100. A cheap SLA charger with 6V/12V
> selection sell at HK$65 at Ap Liu Street. Try them out and find out
> which you lkie most.
>
> Andy
>
> --- In doctorjohn_CheapTubeAudio@yahoogroups.com, "NPM" <npm98@p...>
> wrote:
> >
> > hi Andy,
> >
> > Ok I got the Charlize today. Hooked up to a 9V simple adapter, quite
> a big
> > one non switching type, adde3d a 1500 uf cap to the PS, soldered a
> pair of
> > input RCA females, and (very barely able to) clip my speaker cable
> to the
> > circuit directly, and there is sound!
> > I used my mono FM tuner ( REL) to drive it to listen just 1 ch. The
> sound is
> > mellow on my Rega small floor standing speaker. But it does have a
> big sound
> > and good resolution. Then I used it to drive my 755A. Initially the
> sound is
> > a bit hard, after a few hours it mellowed down.
> > For the size, it is very good and convenient amp!
> > To compare to my tube amps, I think it could easily perform better
> then most
> > tubes amp that is not at optimum condition. But it still would not
> have the
> > air and weight for a good tube amps that is at optimum condition,
> and most
> > tube amps are not operating under optimum condition!! So this little
> amp
> > that could take simple power supply from 9-12V could sound better
> the those
> > tube amps indeed!
> > I will build a proper power supply, tweak it a bit then listen a bit
> longer.
> > What I could see is that the output printed circuit traces from the
> coils
> > are a bit too narrow and definitely it would not be good for the
sound.
> > Unless it is designed that way to produce certain characteristic
of the
> > sound.
> >
> >
> > Best rgds
> >
> > William Lee
> >
> > ----- Original Message -----
> > From: "andy2667" <andy2667@s...>
> > To: <doctorjohn_CheapTubeAudio@yahoogroups.com>
> > Sent: Tuesday, November 29, 2005 11:01 PM
> > Subject: [doctorjohn_CheapTubeAudio] Re: Class T amp
> >
> >
> > > Hi Top,
> > >
> > > Not heard the SI amp. The Charlize is said to be much better
than the
> > > SI. FYI, the midrange of the Charlize is on the thick side compared
> > > with my DRD 300b. Yet, the clarity & resolution is excellent.
> > >
> > > Regards
> > >
> > > Andy
> > >
> > > --- In doctorjohn_CheapTubeAudio@yahoogroups.com, karma barfungpa
> > > <karmathk@y...> wrote:
> > >>
> > >> Howdy Andy,
> > >> I also tried the T-amp, albit the Sonic Impact varity,
> > >> modded it,and now it is in another avtar. I was also
> > >> very impressed with the sound the first time I heard
> > >> it,it was rather bright and very engaging. However
> > >> after a while the desire to listen to it diminished.
> > >>
> > >> A lot of time the Baritone voice needs to come from
> > >> the stomach, perhaps also the toukas (As some one once
> > >> said???), I just felt that the beautiful Baritone
> > >> coming from the T-amp was from the chest. The T-amp is
> > >> a Bocelli to the Tube amps Pavarotti.
> > >>
> > >> It is still a best buy for a lot of ears.
> > >> regards
> > >>
> > >> Tops
> > >>
> > >> --- andy2667 <andy2667@s...> wrote:
> > >>
> > >> > Hello DocJohn & Others,
> > >> >
> > >> > It seems that this forum is not as active as years
> > >> > ago. My discussion
> > >> > on Class-T may a little bit ouside Topic.Just want
> > >> > to share my
> > >> > experience in Class-T amp.
> > >> >
> > >> > I learnt a lot on tube audio from this forum,
> > >> > started in tube gears
> > >> > and settled down on tube amp searching sice
> > >> > completion of my DRD 300B
> > >> > from the Welborne Kit. Intended to explore more on
> > >> > other SET tube amps.
> > >> >
> > >> > My recent experience in class T am changed my mind.
> > >> > I acquired a very
> > >> > little class-T amp (a complete module need add on
> > >> > PSU and connectors)
> > >> > from diyparadise. Tried it and has been amazed.
> > >> > After a period of
> > >> > listening, my beloved DRD 300B may need to retire.
> > >> > Not saying that the
> > >> > Class-T amp sound better than the DRD300B. They
> > >> > sound different but
> > >> > both sound good to the same level. How amazing for
> > >> > this little class-T
> > >> > amp. It cost less than the pair of EH300B tubes. It
> > >> > is still in a
> > >> > small glimsy plastic box shipped with the amp
> > >> > module.
> > >> >
> > >> > What I need to power up the amp was to solder the
> > >> > necessary
> > >> > connector....RCA, Binding posts etc and connect the
> > >> > amp to a SMPS
> > >> > (switched mode Power Supply cost HK$1XX).
> > >> >
> > >> > The class-T amp is so efficient that it can be
> > >> > powered by 12V SLA
> > >> > battery. I think my journey to Tube AMP will stop
> > >> > here temporary. The
> > >> > class-T is so compact, small, efficient , flexible.
> > >> > It sound excellent
> > >> > too!
> > >> >
> > >> > No exotic Power cable, no PSU treatment!
> > >> >
> > >> > In my opinion, a new era in Hi-Fi audio will comes.
> > >> > Hi-Fi Pc, good
> > >> > class D, battery or SMPS powered gears.......
> > >> >
> > >> > By the way, battery powered NOS DAC sound very
> > >> > smooth and good. Not
> > >> > much experience in DAC. Has only used some cheapy
> > >> > CDP and old Philips
> > >> > CD880.
> > >> >
> > >> > I amp now using Class -T main amp, PC + hard disC +
> > >> > battery powered
> > >> > USB sound Card as main source, battery powered NOS
> > >> > DAC. The PC is so
> > >> > convenient that I will cease investigating LP as
> > >> > source.
> > >> >
> > >> > Hope my experience can provide some insights.
> > >> >
> > >> > Andy
> > >> >
> > >> >
> > >> >
> > >> >
> > >> >
> > >>
> > >>
> > >>
> > >>
> > >> __________________________________
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> > >
> > >
> > >
> > >
> > > Yahoo! Groups Links
> > >
> > >
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> >
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