[TechAssist] Re: Classic tubes need 5y3GT
- From: "J Silverman" <greentron@xxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 4 Mar 2004 13:58:02 -0500
You can make a close approximation to the resistor value if you have a tube
manual showing the volt-amp characteristic curve chart for the tube. The
equivalent resistance is the slope of the curve at the operating point. The
slope is the ratio of a small voltage change to the resulting small current
change. Then the actual wattage is current squared times resistance (from
the slope calculation). Usually double or triple the resistor wattage to
make the resistor run cooler.
Jerry Silverman
Greentron Inc
4 Newland Ave
Greenville SC 29609
864 232 3889
Fax 271 2080
mailto:greentron@xxxxxxx
----- Original Message -----
From: <tvservice@xxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, March 04, 2004 9:09 AM
Subject: [TechAssist] Re: Classic tubes need 5y3GT
> You know you can replace that 5y3 with 4 NTE125 rectifiers and a current
> limiter resistor.
> The trick is figuring out what value resistor and now days where to get
> I used to use 20 watt but don't remember the value when I repaired radios
> and amps. back you you could make real money 20 bucks labor and $4 for a
> tube :>)
> Robert
> tvservice@xxxxxxxxxxxxx
> H & H Electronics Inc
> Dallas, TX
>
>
> ----- Original Message -----
> From: "William Dravenstott" <cdravens@xxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Wednesday, March 03, 2004 11:08 PM
> Subject: [TechAssist] Classic tubes need 5y3GT
>
>
> > I am trying to restore a classic guitar amp. Does anyone have a good
> source
> > for classic tubes. I need the 5y3gt rectifier. Thanks
> > Bill Dravenstott
> > Elza's Home Store
> > 924 Union Street
> > Ashland, OH 44805
> >
> >
>
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