[NJARC] (no subject)

[Dave sica]

Jim,

With selenium that's always promoted as good practice for reasons that sound valid to me. Are you saying you think adding a resistor then makes no sense too?

-- Dave "not an engineer" Sica

Sent from my iPad

On Apr 24, 2015, at 12:27 AM, <antqradio at sbcglobal.net> wrote:

> Just remember
> Reply = Poster
> Reply All = Everyone
> 
> _________________________________________________________
> No experience with this vendor but I did find the schematic of this power supply.
> 
> http://tubecad.com/2008/11/blog0151.htm
> 
> In reading the technical description, I fail to see the need to add resistors in series with the solid state rectifiers to "better mimic a tube rectifier".  All I see in this is that one is taking a better silicon diode rectifier (as compared to a vacuum tube rectifier) and then adding series resistance to make the voltage regulation worse.  That is to say that the rectified and filtered voltage will change more with load current (increase the filtered ripple voltage) and then apply this to an IC regulator to restore regulation.  This makes no sense to me.  
> 
> The same idea is used when replacing a selenium rectifier with a silicon diode.  
> Jim
>  
> 
> From: Joe Devonshire via NJARC <njarc at mailman.qth.net>
> To: njarc at mailman.qth.net; dvhrc at mailman.qth.net; NEARC_Radio at yahoogroups.com 
> Sent: Thursday, April 23, 2015 7:56 PM
> Subject: [NJARC] (no subject)
> 
> Has anyone had any experience with this product or other products from this company?  Good / Bad. etc...
>  
> Joe Devonshire
>  
> http://glass-ware.stores.yahoo.net/ps2solo.html
>  
>  
> 
> GlassWare Audio Design
> Thanks for supporting the Tube CAD Journal
> SEARCH
> Home > PS-2 Solo
> The same regulator the PS-1 uses, but without the heater PS
> 
> PS-2 Solo
> Item# PS-2 Reg Kit
> $39.00
> Heat Sink Height: 
> Availability: Usually ships the next business day
> This item is currently out of stock!
> Product Description
> No doubt that this little circuit board (4.5 by 4.25 inches) will make life quite a bit easier for many tube fanciers.
> 
> On this extra thick (0.094 inch), US-made PCB with 2oz-copper traces resides a single high-voltage regulator, with its own raw power supply, including the rectifiers and power-supply reservoir capacitors. In other words, except for the power transformers, the PS-2 Solo PCB holds all that is needed to make a superb tube B+ power supply. The PS-2 Solo regulator can power a line-stage amplifier, headphone amplifier, or phono stage. (It might also work in a tube power amplifier, if the current draw isn’t excessive.) This high-voltage regulator uses a high-voltage series regulator to achieve a quiet and stable regulated B+ voltage, which can span from 50V to 300V, while delivering up to 80mA of current.
> 
> Furthermore, both a full-wave-center-tapped configuration and a full-wave-bridge rectifier arrangement can be used with this PCB. The PS-2 Solo PCB, like the Janus Solo PCB, holds only a single high voltage regulator, unlike the original PS-1 regulator PCB which held both high voltage and low-voltage regulators. Thus, the tube heaters must find their power source elsewhere, such as an AC winding or a simple DC power supply or regulator power supply.
> 
> The PS-2 Solo kit comes with all the parts needed to populate the PCB, including the heat sink, standoffs, and 14 voltage-setting resistors, which allows the following output voltages to be set:
> 
> 50V 60V 65V 75V 110V 120V 125V 130V 135V 140V 150V 160V 165V 170V 175V 180V 185V 195V 200V 210V 215V 220V 225V 240V 250V 270V 300V
> 
> All the resistors needed
> 
> All the capacitors needed (Nichicon, Panasonic, RTI or Wima)
> 
> LD1085 low-dropout voltage regulator
> 
> Heatsinks for TO220 device
> 
> Four sets of PCB standoffs with O-rings
> 
> Four HER108 ultrafast 1A 1000V rectifiers
> 
> IXCP 10M45S HV constant-current source
> 
> 24-Page User Guide
> 
> 
> Just remember
> Reply = Poster
> Reply All = Everyone
> 
> _________________________________________________________
> 
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