8mm Forum: Elmo Gs1200 recording capacitors

»	8mm Forum » 8mm Forum » Elmo Gs1200 recording capacitors

UBBFriend: Email this page to someone!

Author

Topic: Elmo Gs1200 recording capacitors

Flavio Stabile
Jedi Master Film Handler

Posts: 707
From: Roma, Italia
Registered: Feb 2005

posted March 25, 2017 03:29 AM

Hello,

Does anyone know where to find the "3300pf 600v dc 5% max toler. polystyrene (or polyester) capacitors" to be replaced in the Elmo Gs1200 to get recording capabilities again?

Thanks
Flavio

| IP: Logged

Steve Klare
Film Guy

Posts: 7016
From: Long Island, NY, USA
Registered: Jun 2003

posted March 25, 2017 03:45 AM

These should do the job, and I'm pretty sure they ship to Europe too.

3300pF, 600V

The question is are they the right size and shape to to fit.

--------------------
All I ask is a wide screen and a projector to light her by...

| IP: Logged

Phil Murat
Jedi Master Film Handler

Posts: 671
From: Villeneuve St Georges, France
Registered: Dec 2015

posted March 25, 2017 06:17 AM

Hi Flavio,

Any of these works, depending of the size and room you get for installation:
From 100v to..... xxxx V !!

"J" means +/- 5%
It can be labelised 3n3J400 for exemple

Polyester, ceramical, Polypropylene,etc, they work all, may be only sound "Color" could change a bit (Trebble / Bass).....to be confirm

3300 pF

Also, 3300pf = 3,3nf : This could help you for an extended research.
or, also :
3n3 Polyester

NB
If same capacitors are found on both chanels, I suggest you to replace both as a set and from the same batch.....

[ March 25, 2017, 07:31 AM: Message edited by: Phil Murat ]

| IP: Logged

Steve Klare
Film Guy

Posts: 7016
From: Long Island, NY, USA
Registered: Jun 2003

posted March 25, 2017 06:50 AM

Does anybody know what the real voltage is on this cap?

If 600V is overkill you could find a lot of alternatives at lower voltage ratings.

--------------------
All I ask is a wide screen and a projector to light her by...

| IP: Logged

Phil Murat
Jedi Master Film Handler

Posts: 671
From: Villeneuve St Georges, France
Registered: Dec 2015

posted March 25, 2017 07:28 AM

Hi Steve,

There is a high probability the voltage is not very important probably capability is higher than 50V......

Only size icrease a lot from 400, 600, 1250v, etc.....

400v is very common for these capacitors.
Only an "Audio" specialist could help us to confirm how technology of capacitor (i/e polyprop, ceramica, etc...) could have an effect on quality of sound (saturation, etc....)

| IP: Logged

Paul Browning
Phenomenal Film Handler

Posts: 1006
From: West Midlands United Kingdom
Registered: Aug 2011

posted March 25, 2017 08:17 AM

I have replaced one these on the GS, there is only one to replace. The original cap measures 50 odd volts before the change across it, after you replace with new 80 odd volts, can't remember the exact measurement but it is more, and it improved the recording's, so worth doing, but there are bias settings that can be adjusted on these too, which improves this again, and balance's up correctly the recording on the 2 channels.

| IP: Logged

Phil Murat
Jedi Master Film Handler

Posts: 671
From: Villeneuve St Georges, France
Registered: Dec 2015

posted March 25, 2017 08:32 AM

Hi Paul,

Do you mean voltage measured between cap terminals was 50V before replacement ?

| IP: Logged

Paul Browning
Phenomenal Film Handler

Posts: 1006
From: West Midlands United Kingdom
Registered: Aug 2011

posted March 25, 2017 08:44 AM

Hi Phil, yes that's correct, I like to know that the component replacement has at least made a difference, as this is part of the recording circuit, ac across this. These have some odd solder on them I found difficult to remove, so you need a good quality soldering iron, by that I mean, a weller style with power station and a means of getting the solder off or at least removed.

| IP: Logged

Flavio Stabile
Jedi Master Film Handler

Posts: 707
From: Roma, Italia
Registered: Feb 2005

posted March 25, 2017 03:27 PM

Thanks for all suggestions!

Indeed I was trying to find exactly the model I wrote, having read an old post where this argument had been already treated

http://8mmforum.film-tech.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=1;t=001033# 000000

and where it is suggested the type, the minimum voltage and the tolerance...

[Roll Eyes]

| IP: Logged

Renzo Dal Bo
Film Handler

Posts: 70
From: Mogliano Veneto, Italy
Registered: Dec 2016

posted March 26, 2017 02:29 AM

Hi Flavio,

I found one capacitor on eBay that could work: 3300pF 630V 1% Polystyrene

http://m.ebay.it/itm/1pcs-PHILIPS-KS-3300P-40-3300pF-3-3nF-41-630V-1-Axial-Polystyrene-Capacitor-/151664766262?txnId=1527320151005

| IP: Logged

Phil Murat
Jedi Master Film Handler

Posts: 671
From: Villeneuve St Georges, France
Registered: Dec 2015

posted March 26, 2017 03:52 AM

Hi Flavio,

Your link is very instructive!

Looking for 1% instead of 5% leads to increase price x10 approx....

What you can do is to get a batch for 5% and measuring each of them, you keep caps which are closed to nominal value.

As I understand there is a "precize" and "tight" frequency target to reach. So there is a high possibility there is somewhere a "variable" component to adjust this frequenecy (needs probably Oscillo Tool)

In the link on A/M ref it is mentionned 60KHz Frequency approx as a work range.
So to stay on a safe side you can install 2 or 3 (ex: 3 x 1,1nf) caps in a parallel fitting to decrease impedance and allows caps for better work....

[ March 26, 2017, 04:53 AM: Message edited by: Phil Murat ]

| IP: Logged

Flavio Stabile
Jedi Master Film Handler

Posts: 707
From: Roma, Italia
Registered: Feb 2005

posted March 26, 2017 03:36 PM

Ciao Renzo!

many thanks for the link even if it is located in Taipei, Taiwan!
Anyway this is the closest to the one mentioned in the post so I'm very happy to buy it (more than one, of course...) !

Grazie!!!

[Wink]

| IP: Logged

All times are Central

Printer-friendly view of this topic

UBB.classic^TM 6.3.1.2