Hello Eli, Yep you are correct. I dug out the Acro UL II schematic and there are quite a few differences from the link I posted. I also dug up the Heath W3M...
You can use DC instead of AC for 6 and 12 volt filaments. It's cheaper and easier to design if you don't. There is no RMS conversion. 6.3 volts DC would...
... Hash: SHA1 ... They do not require AC to run the filaments. AC is used because it is easier/more practical and usually good enough. Some tubes do require...
Simplest way I can put it - it costs more$$$$ to convert the AC to DC. Roger ... as Usual Jim-R has given me more Information than i can deal with (not real...
Hi errm well there are times when it is better to use DC on heaters but it shortens valve life that is why it is more usual to tap off part of the ht with...
posted earlier: "there are times when it is better to use DC on heaters but it shortens valve life" Why? would think DC of proper voltage would be better ??...
Hi Steve, Why would DC on heaters shortens valve life? Is there any logical explaination for this? Is any difference of this life shortening effect between...
Hi Miklos From what i can remember it causes out gassing and this in the long term stops the cathode from emitting electrons...because of the dc on the heaters...
Hi Miklos, the question of heating tubes with DC or AC can not be answered generally. There are several aspects that determine whether a tube has to be heated...
Thomas, Thank you so much for taking time to post. jim... ... has ... itself ... with ... is ... risk ... handle. ... tubes ... one ... The ... cathode. ... ...
Hi, Thanks to Steven and Thomas for the aswers. Just one thought about "If tubes are heated for prolongued periods without a cathode ... theory aply to...
Miklos, TVs in standby do not heat theit CRT cathodes to 100% to avoid the cathode becoming deaf. This does not elimintate this effect, but it weakens its...
The new photo displays some fine D.I.Y. work being done by Fabio in Italy. He's doing extensive upgrades to a venerable Kenwood KT-7500 tuner but I also see...
Ray, Is this the Fabio who is the singer and is known to like good stereo systems or is this simply an Italian gentleman named "Fabio"? If he's the "FF"...
Hi Tim, Lots of people have put lots meaningfull words to the RFM. ( they have been terribly consistant with the "F" though.) For your effort you get this...
He is just a PVF... ...Plain Vanilla Fabio... I'm happy, nevertheless, to be part of this group! So, many thanks to Jim and Ray for their welcome. I'm...
Hi Fabio, How do you tell a RF from a PVF? ... From: "zumbo98" <fabio.arpino@...> To: <diy_audio_tweaks@yahoogroups.com> Sent: Wednesday, April 19, 2006...
Fabio and Fabio and all, If you're proud of your audio room(s) Feel free to post pictures in the Photos section. I'm there and so is Ray and others. jim... ......
Hi all, I am really interested in the work mainly of D'Antonio (RPG) on diffuser. After reading the, very interesting, book by Alton Everest "Master handbook...
Wandering through RPG patents I went into an interesting, and possibly easier to build, variant of panels. see patent 5,817,992: "Planar Binary Amplitude...
I'm curently reading "Master Handbook of Acoustic" myself. Lot's of info their. Mostly been reading on how to build walls. Have not got to diffuser's yet. But...
I am working on a gain stage and a buffer stage to be used in place of op-amps separated or combined to have a better sounding (hopefully) alternative to...
Yes, of course... cascode! (where did it come that "catode"?!?) I've used in the past both 2N3819 and J309. I am quite satisfied with J309 'cause they have...
Fabio; It looks interesting, very simple compared to a differential input op-amp. Glad to hear you've built it and it sounds good, If I have a minute I'll...
So, how does the flasher circuit absorb noise? ...or is it just a fancy display to harvest money from all the suckers out there, while a simple capacitor...
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