Great info Marc, thanks. My order is on the way from Canada, once I get the unit up and running I can give you some voltage details, if interested. (I've ordered 600V caps for the lot)

As a matter of interest Ashhhh what did they charge you for that? I know they are quite reasonable and I am thinking of doing a few more orders.

$32.50 USD for the lot, which I thought was OK. It would have been ever better if the dollar wasnt so weak!

I have to warn you Ashhhh you will be bitten by the bug . You should have ordered more lol . Any way I hope things go well. ou

100 Ohm resistors were common in some sets, mainly with 6X5. Despite being built for car radio's several variants were mechanically flawed an proved extremely unreliable. Zenith USA used a lot of them under marginal conditions and that did not help.

The benefit of the 100R resistor was not only to soften, but kept marginal & sailing with the wind, it could act as a fusistor & smoke when the rectifier shorted (common with 6X5) saving the transformer, most of the time*

*Transformers also proved marginal in Zenith, not helped by USA upping line voltage & having no taps like ours on the primary to compensate. Thus stressing them.

Marc

Try Bobs Tube Audio.

http://stores.ebay.com.au/Bobs-Tube-Audio/_i.html?rt=nc&_pgn=2&_ipg=48

Try Bobs Tube Audio.

Same SA-based seller aka qch already mentioned above.

Have you thought of RS Components for high voltage caps?

Also consider that the ACTUAL voltage across the cap is sometimes not anything like what the cap is rated at.

For example, I had a paper cap (wax coated), 0.01μF in the IF strip that was rated at 400 volts.


It was functional but I decided to replace it anyway to improve reliability. What the cap ACTUALLY had across it was around 80 volts, so a 200v ceramic was a perfectly suitable replacement.
I think the reason they used 400v cap originally is because "that's what the factory had in stock" - it was not a technical decision, but a stock issue.
So check the voltage across the cap, you may well get away with a lower rated commonly available item. Of course the purists will probably think this is a terrible thing to do - but I take a more pragmatic approach.

Cheers

Radio electrolytic capacitors for radio restoration soon in - limited supply of the 600 volters there is less that 1,500 of all 600 volt types combined. Here are the ratings and prices!

All axial all fine quality & all rated 105 degrees.



10μF 50 volt axial -------------$0.50 ..............less than 1,000 available

22μF 50 volt axial -------------$0.60 ..............less than 1,000 available

22μF 450 volt axial --------------$2.00...............less than 250 available



8μF 600 volt axial --------------$3.35 ..............less than 320 available

16μF 600 volt axial -------------$4.25 ..............less than 320 available

22μF 600 volt axial ------------$5.25 ..............less than 320 available



40μF 600 volt axial -------------$5.50..............less than 280 available

47μF 600 volt axial--------------$5.85..............less than 280 available



Electros, if 45 or more are purchased of any rating combined - be it 50 volt to 600 volt a 10% DISCOUNT APPLIES TO TOTAL ORDER PRICE!



600 volt is getting very hard to locate now, these are the golden electros of radio and only the 3rd shipment we have been able to organise in near 3 years ! There is no better price in Australia on 600 volt quality Electrolytic’caps - in axial form, than what we have. (It’s a where do you get it item) as there are virtually zero outlets of 600 volt axial electros in 2015.

The capacitors will be sent out on exactly the 15th of December ok that’s over 40 days away ! yet for those whom need!!!! Our 600 volters don’t stay in stock long , we have had 6,600 x 600 volters in 7 different types since February 2013, and they are all gone!............ long gone!



It’s The quick or the dead when obtaining of the golden 600 volters, they are ideal for earlier sets, and Audio application.



You put your order in now , I’ll put the order aside, and all orders will be posted on the 15th of December as I’m away during the early weeks of December.

It is really first in best dressed, as the mail goes out to 1,500 in radio , it won’t take long for 40 or 55 people to consume all stock. The first orders in I can fill and keep on filling until all are gone / spoken for.

We will take pre - orders now! Orders are secured when payments are in.

You can see how many caps there are ( not a lot ) actually I wish we had 3 times as many !



POSTAGE TO ANYWHERE IN AUSTRALIA UP TO 500 GRAMS AT $7.45



STEVE



Other goods still available 1 / 2 / and 3 watt resistors !



ASTOR MICKEY KL TO HPM BACKBOARDS - $15 EACH.

ASTOR MICKEY KM VICTORIA DIALS – NOT MANY’ LEFT, ENQUIRE OF PRICE!

ASTOR MICKEY KM NSW DIALS – NOT MANY’ LEFT ASK OF PRICE!

MULLARD METEOR DIALS IN GLASS - LIMITED SUPPLY $20 EACH.

STC EIFFEL TOWER BAKELITE BACK BOARDS NOT A LOT LEFT - $10 EACH.



Other goods apart from electros - postage calculated on the order!



Australian vintage wireless

The home of Radio History

25 years in supplying the radio world, with 78,000 parts orders sent out since 1990.

We take pride in making life easy and affordable for the radio restorer.

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Is it not ok to use a pair of 350V caps in series?
They do it in industry with high voltage power supplies.
No good of course, if you were going to stuff the original caps.

350 volt caps in series would work but remember that this reduces the capacitance. EG: Two 1μF capacitors connected in series will have a total capacitance of less than 1μF. And if the series-connected capacitors have different values the total capacitance will be less than the smallest capacitor in the series circuit. EG: a 1μF capacitor in series with a 2μF capacitor would equal less than 1μF.

It can become complex and there is a formula to work it out accurately - I'd recommend sticking to replacing components like for like.

Yes I should have mentioned that, The same as is the case for series connected batteries.
But for electrolytics, a lot of the lower values can be made exactly (or close) by using two caps.
My thinking is you could buy Nippon Chemicon or whatever expensive caps,
and still come out cheaper and with an overall much higher voltage breakdown that the original.

When connecting capacitors in series, especially electrolytics, it is usually recommended that they have balancing resistors across them in order to keep the voltage equal across each cap.

I found the video with the 600Volt PSU. I think they also had the resistors.
One of Dave Jones’ EEVBlog videos: https://www.youtube.com/watch?v=G_MMIv5ia5g

The cost of electrolytics seems to ramp up heavily after a certain voltage,
but I can’t think of any safe way to test long term, a bank of two filter caps for 100Hz vs a single one.

There was considerable debate on the pros & cons of dividers across series Electrolytic caps. Some felt that the modern caps did not need them. I have seen enough examples to say that with electrolytics in Power supplies only; A voltage divider is desirable if they are in series.

The old Heathkit CRO I have here has two 450V ones in series with dividers on its EHT (runs around 730VDC) and that is how it is designed to be.