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Whats the difference between A59-13W & A59-15W CRTs ?

PostPosted: Fri Sep 09, 2016 8:05 pm
by marc
Hi all,

I have a KB WV90 telly which is fitted with a tired A59-13W CRT, now I may have a chance of sourcing an A59-15W and wondered what the difference was and whether the two can be interchanged.
I've found data for the A59-13W but can't find anything on the A59-15W, any ideas anyone ?

Cheers,
Marc.

Re: Whats the difference between A59-13W & A59-15W CRTs ?

PostPosted: Fri Sep 09, 2016 8:13 pm
by nuvistor

Re: Whats the difference between A59-13W & A59-15W CRTs ?

PostPosted: Fri Sep 09, 2016 8:29 pm
by marc
Thanks for your reply Frank,

But like an idiot I requested the wrong tube data, it's the A59-13W I'm missing :ccb :ccg

Marc.

Re: Whats the difference between A59-13W & A59-15W CRTs ?

PostPosted: Fri Sep 09, 2016 8:34 pm
by nuvistor
You have the information of the 13w with having the set and service manual. The info on the 15w should determine if it's a possiblity. Looking at the 15w the first thing to notice is it requires a seperate safety screen, either hard plastic, Fenbridge or safety glass. If the 13w has the safety glass built in or the Panorama type it would appear to not be suitable without sorting out the protection.

Frank

Re: Whats the difference between A59-13W & A59-15W CRTs ?

PostPosted: Fri Sep 09, 2016 8:50 pm
by crustytv
Interesting, I checked my Mullard maintenance manuals back to 1961, I don't think the A59-13W is earlier, all I can find is the following.

The A59-13W can be replaced directly by the A59-16W or the CME2306. A later edition in 1974 states the A59-23W can be used and comes with a "inckit 1" to facilitate conversion.

The A59 15W is mentioned in the books but not in the context of a suitable replacement for the 13W.

Re: Whats the difference between A59-13W & A59-15W CRTs ?

PostPosted: Fri Sep 09, 2016 9:06 pm
by nuvistor
The A59-16W has integral implosion protection, I reckon tbe the 15W was intended to have a Fenbridge guard. So unless the safety aspect and mounting can be sorted out the 15w is not an easy replacement.
https://frank.pocnet.net/sheets/030/a/A59-16W.pdf
Frank

Re: Whats the difference between A59-13W & A59-15W CRTs ?

PostPosted: Fri Sep 09, 2016 9:14 pm
by slidertogrid
Maybe this is the kit Chris referred to? ISTR some regunners didn't regun twin panel tubes. they supplied an unprotected tube with a suitable " mod kit" to fit it..
Rich.

Re: Whats the difference between A59-13W & A59-15W CRTs ?

PostPosted: Fri Sep 09, 2016 9:35 pm
by nuvistor
slidertogrid wrote:Maybe this is the kit Chris referred to? ISTR some regunners didn't regun twin panel tubes. they supplied an unprotected tube with a suitable " mod kit" to fit it..
Rich.

The A59-23W is a Panarama/Rimband CRT suitable for push through presentation. So if the 13W is not push through perhaps the kit sorts that out. They would not supply a kit if not required.

I never replaced a twin panel with a third party regun, used Mullards. Always worried, perhaps without foundation, third parties abilities to regun twin panel and Panarama/Rimband CRT's safely.

Marc, could you confirm the type of CRT is, Twin panel etc.

Frank
edit, what is frustrating that 40 years ago I would have known the answer to Marc's question :ccb

Re: Whats the difference between A59-13W & A59-15W CRTs ?

PostPosted: Fri Sep 09, 2016 9:51 pm
by marc
Hi all,

Thanks for your replys

The original 13W is a push through twin wall and I note the KB state that a 23W with "inckit 1" can be used as a replacement.
I think Frank is on the right track, it looks like the 15W may require a safety guard by the looks of things so not really suitable as a replacement for the 13W in terms of this KB WV90 shown below.

Oh well back to the waiting game for a 13 or 23 with kit....don't suppose anyone has one ? :aaq

Cheers,
Marc.
DSCF2696 (Small).JPG
KB WV90 fitted with original A59-13W CRT

Re: Whats the difference between A59-13W & A59-15W CRTs ?

PostPosted: Fri Sep 09, 2016 10:23 pm
by chriswood
From the MAZDA Valves & PictureTubes
DATA BOOKLET 1966

A59-I3W
23 in, TWIN PANEL
Self-Protected
0-3A, 6-3V Heater
Features
Short neck
110° deflection
Electrostatic focus
Straight gun
External 'dag
Aluminised screen
Tinted bulb and panel, light transmission 40%
Maximum Neck diameter 29-4 mm
Maximum Overall length 374 mm

A59-I5W
23 in. UNPROTECTED*
3A, 6-3V Heater
Features
Dark screen
Short neck
1 10° deflection
Electrostatic focus
Straight gun
External 'dag
Aluminised screen
Grey glass,light transmission 45%
Maximum Neck diameter 29-4 mm
Maximum Overall length 367 mm

I hope that helps
Chris

Re: Whats the difference between A59-13W & A59-15W CRTs ?

PostPosted: Fri Sep 09, 2016 10:26 pm
by chriswood
I should also add the 1968 book describes the A59-13W/s as Bonded Glass Cap protected.
Chris

Re: Whats the difference between A59-13W & A59-15W CRTs ?

PostPosted: Fri Sep 09, 2016 10:29 pm
by marc
Thanks Chris,

That unfortunately does confirm the 15W is not a suitable replacement for the 13W in this instance :cch

Marc.

Re: Whats the difference between A59-13W & A59-15W CRTs ?

PostPosted: Sat Sep 10, 2016 10:23 am
by chriswood
Marc, as said in the earlier post an A59-16W is listed as an equivalent in the Mullard data book 1969 so that is one more to add to your search list along with CME2306 and possibly 11W and 12w as they are listed in the in the Radio valve and Semiconductor data book by Ball as having Rimguard protection.
Chris

Re: Whats the difference between A59-13W & A59-15W CRTs ?

PostPosted: Sat Sep 10, 2016 11:09 am
by Till Eulenspiegel
The 19" twin panel A47-13W and A59-13W tubes were initially marketed by Brimar and later by Mazda, which was also a Thorn-AEI company. Mazda types CME1906 and CME2306.
Mullard also supplied these twin panel tubes, I'm not sure if the tubes were simply sourced from Brimar or if the company made the twin panel tubes. Mullard used the same type number, A47-13W.
Later on in the late sixties Mullard offered the "IncKit" which was designed to the replace the old twin panel tube by employing the A47-26W, this tube employed a reinforced faceplate called by Mazda as Rimband III.
The IncKit was expensive and I never used one as a replacement for my rental sets, preferring to buy rebuilt twin panel tubes instead. Anyway, by the mid seventies sets like the KB VV10 series were nothing more than just old tellies and considered not fit for reissue as rental sets.
Attachment shows details of the Mullard IncKit system.

Till Eulenspiegel.