From: "jrusgrove@comcast.net" <jrusgrove@comcast.net>
To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
References: <336545566.20190511184405@gmail.com>
 <1UTJHp87NM.2LemuKEGHv@optiplex980-pc> <475810047.20190512125038@gmail.com>
Date: Sun, 12 May 2019 12:18:12 -0400
Message-ID: <1UTJHsWaAT.3NHw5CM2m0M@optiplex980-pc>
In-Reply-To: <475810047.20190512125038@gmail.com>
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Subject: Re: LF: Re: MF amp
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Chris

Don't think the problem is on this end as your's is the one and only e mail where the reply to fills in an unexpected, Blacksheep, e mail address. Perhaps you replied to an earlier Blacksheep reflected e mail of mine and 'harvested' my e mail address to use in the To: box? That may be very different than starting a new 'clean slate' e mail in your e mail client and typing in my e mail address from scratch or doing a copy and paste. Suggest sending me a 'clean slate' e mail as a test to see if this explains the unusual behavior.

Jay W1VD       

----- Original Message -----
From: Chris Wilson <dead.fets@gmail.com>
Reply-To: <rsgb_lf_group@blacksheep.org>
To: <rsgb_lf_group@blacksheep.org>
Sent: 5/12/2019 7:50:38 AM
Subject: Re: LF: Re: MF amp
________________________________________________________________________________


Hello  Jay,  understood  re short probe ground and cap values, thanks.
BTW,  mail  direct to you is still being replied to via Blacksheep! So
something  is  amiss  with  your mail filtering perhaps? Thanks again,
have a good weekend.

Sunday, May 12, 2019, 12:16:52 PM, you wrote:

> Chris

> Sorry for slow reply ... been having intermittant e mail problems.

> The value is not critical. What is required is a good ground at
> that point. Whatever combination of capacitors  works best is what
> you want to go with. No doubt this will vary from layout to layout
> and capacitor type to capacitor type. Use a scope to monitor voltage
> across the capacitors. Don't use the scope probe ground lead or hook
> clip as this will not give an accurate reading of what's going on.
> Instead, remove the hook clip assembly and fashion a piece of #14
> bare copper wire with several turns and a pigtail. The turns should
> be sized to fit tightly over the scope probe ground sleeve. The
> short pigtail can be temporarily soldered to the circuit board such
> that the 1/4" scope tip comes in contact with the capacitor. The
> idea is to keep the scope leads as short as possible.

> Jay


> ----- Original Message -----
> From: Chris Wilson <dead.fets@gmail.com>
> Reply-To: <rsgb_lf_group@blacksheep.org>
> To: <jrusgrove@comcast.net>
> Sent: 5/11/2019 1:44:05 PM
> Subject: MF amp
> ________________________________________________________________________________


> Hi Jay,

> Sorry to be a pain, nearly finished the 1kW MF amp of your design,
> please clarify if the center tap transformer to ground cap stack needs
> to be exactly 0.56 uF, or if it's a typo and needs to be only 0.5 uF,
> what's confusing me is where it states stacking just 0.1 uF MLC
> chips... Thanks :)

>   


-- 
Best regards,
Chris                            mailto:dead.fets@gmail.com