Schaub Kongress H (1950)

[pwdrive]

I'm not sure what any differences are Alan, I will have a look in my data book, meanwhile here's a link where you can get access to the valve listings from which I got that data sheet from:

http://frank.pocnet.net/sheets0.html

Lawrence.

[pwdrive]

The UCH71 isn't listed in my data book, only it's supposed equivalent the UCH21.

The only online datasheet I can find for the UCH71 (frank.pocnet) seems to be in a foreign language.

EDIT: The UCH71 and the UCH21 base connections appear to be the same.

Lawrence.

[pwdrive]

According to this:

http://books.google.co.uk/books?id=IEoWAwAAQBAJ&pg=PA488&dq=uch71+tube&hl=en&sa=X&ei=ETsxVOOxFIrzaqjCgdAG&ved=0CCMQ6AEwAQ#v=onepage&q=uch71%20tube&f=false

There are (apart from the heater specs) some small differences between the ECH71 and the UCH71.

Lawrence.

[AlanBeckett]

Thanks Lawrence.
I usually use Frank's site for Datasheets is there's none in the Valve Museum.

Alan

[pwdrive]

According to this:

http://books.google.co.uk/books?id=IEoWAwAAQBAJ&pg=PA488&dq=uch71+tube&hl=en&sa=X&ei=ETsxVOOxFIrzaqjCgdAG&ved=0CCMQ6AEwAQ#v=onepage&q=uch71%20tube&f=false

There are (apart from the heater specs) some small differences between the ECH71 and the UCH71.

Lawrence.

Based on above there appears to be no electrical differences between the ECH71 (as above) and the ECH21 (in my valve data book)

But having said that the specs in the Babani book (above) do not give inter electrode capacitances for the ECH/UCH71, my valve data book does give some for the ECH/UCH21 heptode section, they are as follows: cgk = 6.8 pf, cak = 9.5 pf, cga = 0.002 pf.

Those capacitances seem to (I think) tally up with the inter electrode capacitances given for the ECH/UCH71 in the data sheets from frank.pocnet.

All this seems to indicate no electrical difference between the ECH21 and the ECH71, ditto between the UCH21 and the UCH721.....possibly...

EDIT: Just for reference my own valve data book I used is the Radio Valve Data 8th edition (1966) Iliffe Books, not a bad book, also includes early semiconductors etc. The only problem is that they seem to have been published using absolutely non acid fee paper...

Lawrence.

[AlanBeckett]

A couple of ebay Sellers list them as the same although that's not much to go on.
We may have to wait for John to get it going.

Alan

[pwdrive]

Found this one on Ebay:

http://www.ebay.com/itm/ECH71-ECH21-LORENZ-SEL-TRIODE-HEPTODE-Rohre-Tube-Valve-NOS-NIB-NEW-IN-BOX-TESTED-/390926630146?pt=R%C3%B6hren&hash=item5b050afd02

Brand = Lorenz it has ECH21 and ECH71 printed on the envelope.

Lawrence.

[AlanBeckett]

Poor John, he thought he was going a start a quiet little Thread and now he's got 16 Replies

Alan

[pwdrive]

I'm wondering if the difference between the ECH/UCH21 and the ECH/UCH71 is just mechanical, maybe the electrode connections to valve pins, ie: separate valve pins versus valve pins being part of the electrode structure...dunno.

Lawrence.

[Geaney]

Poor John, he thought he was going a start a quiet little Thread and now he's got 16 Replies

Alan

Well its true that I just posted it as a sort of intro since I won't be starting on it just yet but its always encouraging when I see the support from members of this forum. Of course my hope is the valves in my set work fine and I won't need to concern myself with base pin-outs, equivalents, etc.

A chap can remain optimistic.......

Cheers, John