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Old 3rd December 2010, 05:03 PM   #191
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Is this thread dead ?
I was wondering if anyone considered the european KDD1 double triodes ?
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Old 5th December 2010, 07:04 PM   #192
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I've not seen this tube. There are a few double triodes out there like 3a5, 1J6 and 3B7. The first two sound good - may be a nice sound? Seems to be configured for zero bias, though looks as if it's usable at a bias of 5 to 10v.

andy
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Old 5th December 2010, 08:43 PM   #193
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Quote:
Originally Posted by andyjevans View Post
Though it is a LOT like using Kodachrome 25 with Leica glass. It's exactly that crystalline fresh reproduction.
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Originally Posted by tubelab.com View Post
Remember the original Kodachrome advertising stated that Kodachrome delivers pleasing color rendition, not accurate color rendition. Worked well for Kodak.
If we are reviving a dead thread, DHTs have outlived Kodachrome -- Dec 30th 2010 is the last day for processing if you have any laying around.
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Old 5th December 2010, 09:19 PM   #194
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Good call!! I still have my Leica lenses, though I use them on my Canon digital body with an adaptor.

Must be two years since I used film. I'd sell all my camera bodies except they still have bits of film in them and I can't be bothered to finish the films off and process them!!

Anyone want a load of camera bodies - Leica R, Contax etc?

Andy
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Old 5th December 2010, 09:51 PM   #195
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sad

look like dht TuttoRolleiForum - 60 anni fa: Kodachrome 4x5
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Old 6th December 2010, 12:00 AM   #196
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Anyone want a load of camera bodies - Leica R, Contax etc?
It's sad that they never came out with digital backs for some of these. I thought that was going to happen with the Contax G at least.

At any rate, my DHT's have been replaced by transformer coupled differential MOSFET followers, which I must say sound (and measure) better
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Old 6th December 2010, 05:16 AM   #197
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Too bad about Kodachrome. Best color film I ever used.
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Old 6th December 2010, 09:48 AM   #198
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Dsavitsk dht > pentodo and now mosfer ?


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Old 5th May 2011, 07:37 AM   #199
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post 128
Seeing as the DHTs are 100s of times more sensitive to microphonics than indirectly heated tubes (40+ dB), it will be interesting to see if the more microphonic tubes have better DHT sound or not.
[...]
The strong 588 Hz resonance on the 1J6G tube I initially measured had a very narrow resonance frequency (only about 10 Hz wide for exiting it from the computer sound card generator) and a very high Q. It would ring for several seconds after I removed the stimulus.

Don
Jumping back in the discussion, and I am just at post 128, I like to note I had a 6J6 for an input in a differential preamp and used that for about ten years, excellent sounding, but also microphonic and it could enter in strange oscillations, induced from strong jumps in passages, giving a metallic ringing of several seconds.
Note the 6J6 is a IHT, with just one central heater.
So I guess it is the mesh wires of the grid that do give this effect.

I gave up on this pre-amp because of the microphonics (with a stepped att this is not practical). For the record.
I built a 3A5 linestage, but never took it in production either. [I am now with Aikido for how long that lasts]
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