|
11-06-2007, 11:37 PM
| #1 |
| Junior Member Join Date: Nov 2007
Posts: 1
| Plexi, is it safe to power up?
I've just taken delivery of a 40 year old Marshall JPM50 Plexi, which has lay in someone's attic for twenty years unused. Every thing looks ok, when I turn the power switch on with an ohmmeter across the power cord I get a resistance measurement of 12.5 Ohms. I would be grateful for comments on the following:- With that resitance reading will it be safe to connect to a power supply and switch on. Any tips on how I should approach power up as this thing has been idle for so long. Regards and Thanks Manilito |
|  |
| ...and now, a word from our sponsor: |
| |
|
11-07-2007, 12:52 AM
| #2 |
| Old Timer Join Date: May 2006 Location: NYC
Posts: 1,256
|
It is best to power it up thru a variac or a current limiter first,to "re-form" the caps.IME an amp that has sat that long without being powered up needs to be re-capped anyway,so you may want to skip the "safe" power up and go right to a re-cap.
|
|
| |
|
01-10-2008, 02:36 AM
| #3 |
| Member Join Date: Jul 2007 Location: NYC
Posts: 21
|
i second that.....re cap it, then bring it up with a variac, slowly, so you have a chance to see if anything has gone wrong before you reach the danger zone! :-)
|
|
| |
 |
| Bookmarks |
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
| Thread Tools | |
| Display Modes | |
| |
| ||||
| Thread | Thread Starter | Forum | Replies | Last Post |
| 15w Alnico Blue [safe w/15w ?] | petemoore | 5 E 3 | 9 | 03-02-2008 06:18 PM |
| Alnico Blue..Safe in my Vintage 5E3 | Gibby | 5 E 3 | 14 | 02-04-2008 04:22 AM |
| Installing a Bigsby vibrato arm myself. Safe? Smart? | Wiborg | Guitar Tech | 3 | 09-18-2007 03:33 AM |
| When is it safe to work on? | ajs | Maintenance, Troubleshooting & Repair | 1 | 07-16-2007 02:27 AM |
| Plexi | JC@ | Vintage Amps | 11 | 06-16-2006 01:21 AM |
Linear Mode
