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In Reply to: RE: Is running DHT's in H plane Ok ? posted by Johno on August 11, 2016 at 18:00:14
Hi Johno,
Well, the driver tube is a 12AX7, so that can go any way, The Type 45 ST tube, IF it does develop a problem, can be replaced for $30.00 or less on eBay, if one is careful and patient. Last week, I bought one 45 ST, tested at 79 on a TV-7 ( 82 is new ) and it was about $25 with shipping.
What concerns me the most now is owning an amp where the film caps are not optimized, in two areas:
(1) Their 180 degree orientation, as to how they were wound, and thus sound different, with each orientation
(2) The cap's OPTIMUM lead out material, in terms of AWG, and wire type, so as not to lose energy, dynamics, and wide bandwidth.
I figure this Johno, I can always replace a 45 ST tube, but the cap being optimized or not in the amp, is a permanent degrade or enhancement. Addressing that is up to the listener / user of the amp.
I am most curious to hear what happens once I try to optimize the film caps in the amp, and the overall listening result on my VOTTs !!
I TRIED out the Mueller BU-60C all copper alligator clips yesterday, ( Alpha Al's suggestion ) and used Mueller's ( entire clip ) insulators, BU-62-0 and 62-2 and was able to easily hear their superiority over the cheapo alligators I was initially using. Ordered more Mueller parts from Mouser today, so I can do this A-B work less impeded.
Fun.
Jeff
Follow Ups:
Hi Jeff,
always a dilemma for DIY builders testing equipment under the bonnet post build. Avoiding a hernia from lifting is a personal priority.
I destroyed a pair of expensive KR300B's back in 2000 testing amp in H plane. So today I test my completed builds using a adjustable wood cutting horse sitting on a work bench with the amp on top, amp sits vertical & relatively comfortable to work under.
PS - The statement posted by Paul by 'WE'
"The 300B spec sheets indicate the filament plane as pins 1 and 2, which must be vertical if the tube is horizontal".
Question - How can a valve mounted in H plane & maintain V filament ?
Cheers Johno
So, you speak from direct experience. Sorry to hear about the loss. Thanks for sharing it with us all.
The difference in a cap being in and out 180 degrees in a circuit is a bigger fish to fry, IMHO.
The difference between me modding a lovely DynamiCap 4.0 E, using either one ( or using two runs, in parallel ) of 16 AWG Mil Spec wire as the cap's lead out, is totally HUGE on my " very well wired " high efficiency speaker crossovers, as it was in my 45 amp, with a 0.033 uF teflon...in each case, a single cap !!
And what is interesting is, few DIYers in audio has gone at this, full bore.
In the weeks ahead, I will gain first - hand doing and listening experience. Lovely....can't wait to hear the end result.
Jeff
You probably use more Dynamicaps than I do, but I would warn you to be very careful if you are messing with the leads at or near where they enter into the body of the capacitor. Dynamicaps, like the Infinicaps that went before them, are very fragile where there is a glop of solder between the lead and the body.
Apart from that, I would be very interested to know whether there is any trend to your findings about capacitor orientation, using the listening method. Are you finding in general that what is considered electrically optimal (outer foil toward lowest impedance) is also optimal for your subjective evaluations? Or is there no consistent relationship? Thanks.
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