23-06-2021, 08:30 PM
Hi Bob, still worth doing the pin 4 mod as it is not known what might be fitted in the future
Ed
Ed
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Bush DAC90A Chassis
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24-06-2021, 05:56 PM
(23-06-2021, 08:30 PM)Ed_Dinning Wrote: Hi Bob, still worth doing the pin 4 mod as it is not known what might be fitted in the futureSaid that way back....................................................................
Boater Sam.
25-06-2021, 12:58 AM
boater sam Wrote:Ed_Dinning Wrote:Hi Bob, still worth doing the pin 4 mod as it is not known what might be fitted in the futureSaid that way back.................................................................... Cloying, isn't it  I wonder how many otherwise good, sooty valves have been thrown out.
25-06-2021, 08:29 PM
Hi Ed & every one thanks for advise keeping this one as standard as it is not getting used much been slightly OT my main set is a white DAC90A i fitted Ed Dinning auto transformer did my modification fitting a UL44 valve and this set runs very cool nice bright dial lamps but not over the top and it sound great and is very reliable kind regards Bob
26-06-2021, 07:49 AM
(This post was last modified: 26-06-2021, 07:51 AM by Murphyv310.)
(25-06-2021, 12:58 AM)Amie Wrote:boater sam Wrote:Ed_Dinning Wrote:Hi Bob, still worth doing the pin 4 mod as it is not known what might be fitted in the futureSaid that way back.................................................................... The thing is they still leak. Even lifting pin 4 isn't a total cure. I've seen many with positive grid 1 volts upsetting the bias. 10P13s are hard to find as it is and when used as a frame output there is no direct equivalent for vintage TVs a UL41 or 44 will work but linearity often cannot be corrected, so it's now a shift from those that collect DAC90As and us with 405 Line TVs. My personal belief is to fit a UL84 and rebase the holder, these are very reliable valves and in more plentiful supply. We don't want the radio collectors pinching our TV valves
26-06-2021, 08:43 AM
I have gone over to UL46 as a sub. Easy to arrange the top cap connection.
Boater Sam.
26-06-2021, 08:45 AM
(This post was last modified: 26-06-2021, 08:47 AM by Murphyv310.)
Oh no.
Another rare TV valve What with audiophools now its DAC90Aphools 
(26-06-2021, 08:45 AM)Murphyv310 Wrote: Oh no.Well Trevor, you have almost exclusive use of the EF80 apart from early VHF tuner heads. You can't have it all your own way! 
Boater Sam.
26-06-2021, 08:54 AM
A UL84 conversion is the recommended replacement for a UL41 in my 1970 Mazda data book, with a bigger cathode resistor.
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