Replacing a Glass Passivated Junction Plastic Rectifier - UK Vintage Radio Repair and Restoration Discussion Forum

collisr · 6th Sep 2017, 12:57 pm

Hi again,

In my ongoing attempts to fix my Video 2000 player, today's investigation into the power supply board has highlighted a possible problem with 2 "Glass Passivated Junction Plastic Rectifiers". The service manual of the player (a VR2022) is highlighting two Philips/Vishay components (GP20A, GP30A).

I am struggling to understand what is the modern-day equivalent of these components.

The vishay site states:
GP30A (DO-201AD):
IF(AV) 3.0 A
VRRM 50 V, 100 V, 200 V, 400 V, 600 V, 800 V, 1000 V
IFSM 125 A
IR 5.0 μA
VF 1.2 V, 1.1 V
TJ max. 175 °C
Package DO-201AD
Diode variations Single die

GP20A
IF(AV) 2.0 A
VRRM 50 V to 600 V
IFSM 65 A
VF 1.2 V, 1.1 V
IR 5.0 μA
TJ max. 175 °C

Q1) Does anyone have experience of these failing - if so what typically results? (I am seeing a 16v measurement appear as 11-12v)

Q2) Would the following be an acceptable replacement for the GP30A
http://uk.rs-online.com/web/p/rectif...iodes/6289502/

(I can't seem to find an equivalent for the GO20A - any ideas?)

[Sorry for the continued reliance on the kind members of the community. I am only just learning this stuff]

Rob

Herald1360 · 6th Sep 2017, 5:37 pm

Bung in a couple of 1N5408 I reckon.

Or 1N540x if ac input is lower than mains- the x is hundreds of volts.

Edit: Should have clicked on that RS link first and just said "Yes" .......

turretslug · 6th Sep 2017, 5:56 pm

If these are for SMPSU secondary side rectification, diodes specifically listed as fast recovery would be wise, as the 1N540x series have been around since the Ark and, being so multiply-sourced, it's going to be difficult to get specification guarantee on them- they might work, or they might just sit there getting hot and making (electrical) noise. There is a UF540x series (Ultra Fast!) of equivalents intended for HF PSUs that shouldn't break the bank, there were also a spread of BYxxx coded devices with fast recovery at varying amperages- some of the folk here with day-to-day experience of TVs and/or SMPSUs may have a few types in mind.

collisr · 6th Sep 2017, 5:59 pm

Awesome. Thanks. Will give that a whirl.
-------------

So many projects and not enought time. Or knowledge

Diabolical Artificer · 7th Sep 2017, 10:02 am

I have 4 RGP30J pulls if any use to you with long leads. They show a V drop of .435v. you would suppose if your rails are low and the diodes are faulty for the Vdrop to be more. I've never had that, they usually just go OC or short rarely.

Andy.

6th Sep 2017, 12:57 pm	#1
collisr Pentode Join Date: Oct 2016 Location: Ware, Herts, UK Posts: 171	Replacing a Glass Passivated Junction Plastic Rectifier Hi again, In my ongoing attempts to fix my Video 2000 player, today's investigation into the power supply board has highlighted a possible problem with 2 "Glass Passivated Junction Plastic Rectifiers". The service manual of the player (a VR2022) is highlighting two Philips/Vishay components (GP20A, GP30A). I am struggling to understand what is the modern-day equivalent of these components. The vishay site states: GP30A (DO-201AD): IF(AV) 3.0 A VRRM 50 V, 100 V, 200 V, 400 V, 600 V, 800 V, 1000 V IFSM 125 A IR 5.0 μA VF 1.2 V, 1.1 V TJ max. 175 °C Package DO-201AD Diode variations Single die GP20A IF(AV) 2.0 A VRRM 50 V to 600 V IFSM 65 A VF 1.2 V, 1.1 V IR 5.0 μA TJ max. 175 °C Q1) Does anyone have experience of these failing - if so what typically results? (I am seeing a 16v measurement appear as 11-12v) Q2) Would the following be an acceptable replacement for the GP30A http://uk.rs-online.com/web/p/rectif...iodes/6289502/ (I can't seem to find an equivalent for the GO20A - any ideas?) [Sorry for the continued reliance on the kind members of the community. I am only just learning this stuff] Rob

6th Sep 2017, 5:37 pm	#2
Herald1360 Dekatron Join Date: Feb 2007 Location: Leominster, Herefordshire, UK. Posts: 16,536	Re: Replacing a Glass Passivated Junction Plastic Rectifier Bung in a couple of 1N5408 I reckon. Or 1N540x if ac input is lower than mains- the x is hundreds of volts. Edit: Should have clicked on that RS link first and just said "Yes" ....... __________________ ....__________ ....\|____\|\|__\|__\_____ .=.\| _---\__\|__\|_---_\|. .........O..Chris....O

6th Sep 2017, 5:56 pm	#3
turretslug Dekatron Join Date: Nov 2011 Location: Surrey, UK. Posts: 4,400	Re: Replacing a Glass Passivated Junction Plastic Rectifier If these are for SMPSU secondary side rectification, diodes specifically listed as fast recovery would be wise, as the 1N540x series have been around since the Ark and, being so multiply-sourced, it's going to be difficult to get specification guarantee on them- they might work, or they might just sit there getting hot and making (electrical) noise. There is a UF540x series (Ultra Fast!) of equivalents intended for HF PSUs that shouldn't break the bank, there were also a spread of BYxxx coded devices with fast recovery at varying amperages- some of the folk here with day-to-day experience of TVs and/or SMPSUs may have a few types in mind.

6th Sep 2017, 5:59 pm	#4
collisr Pentode Join Date: Oct 2016 Location: Ware, Herts, UK Posts: 171	Re: Replacing a Glass Passivated Junction Plastic Rectifier Awesome. Thanks. Will give that a whirl. ------------- So many projects and not enought time. Or knowledge

7th Sep 2017, 10:02 am	#5
Diabolical Artificer Dekatron Join Date: Jul 2009 Location: Sleaford, Lincs. UK. Posts: 7,670	Re: Replacing a Glass Passivated Junction Plastic Rectifier I have 4 RGP30J pulls if any use to you with long leads. They show a V drop of .435v. you would suppose if your rails are low and the diodes are faulty for the Vdrop to be more. I've never had that, they usually just go OC or short rarely. Andy. __________________ Curiosity hasn't killed this cat...so far.