Search found 3465 matches

by David Root
Sun Apr 17, 2016 10:07 pm
Forum: Technical Discussion
Topic: OT Impedance Match with VVR
Replies: 16
Views: 2432

Re: OT Impedance Match with VVR

Martin, I see that, but I should have been a bit clearer in my post. I would be maintaining the OT secondary at the same setting, eg 8 ohms, not switching it around. The bias voltage changes though, at least in the 7591 datasheet page. See top of page 2. I thought the VVR does that as well as change...
by David Root
Sun Apr 17, 2016 6:59 pm
Forum: Technical Discussion
Topic: artificial heater center tap placement
Replies: 1
Views: 430

Re: artificial heater center tap placement

I would put them on the terminal strip. Easier to access if you ever need to replace them, and looks better too, IMO.
by David Root
Sun Apr 17, 2016 6:41 pm
Forum: Technical Discussion
Topic: OT Impedance Match with VVR
Replies: 16
Views: 2432

Re: OT Impedance Match with VVR

I have been thinking about doing a VVR Express with 7591s. According to the datasheet this tube has a very flat impedance curve vs plate voltage, so presumably making the power output more or less linearly related to plate voltage, while maintaining the optimum impedance if you use a 6K6 OT. Did I m...
by David Root
Fri Apr 15, 2016 8:44 pm
Forum: Technical Discussion
Topic: Resistor types
Replies: 10
Views: 1518

Re: Resistor types

CC resistors handle surge voltages better than most other construction. That is why some hifi guys like them as screen resistors. Personally I wouldn't use them as droppers in a power supply. Fender did and usually underrated them too. I had a '62 Deluxe that I bought with the 1k 2W dropper that eve...
by David Root
Fri Apr 15, 2016 8:30 pm
Forum: Technical Discussion
Topic: Cap composition and placement preferences
Replies: 2
Views: 626

Re: Cap composition and placement preferences

I'm not aware of any TW Express that used PP caps. The odd Dumble did though. In this type I generally use older NOS 6PS or (even older) chocodrops. (PP is a bit too bright for me). These were all difilm construction, ie mylar (polyester) and paper. This is cork sniffing I'll admit but difilm constr...
by David Root
Fri Apr 15, 2016 8:09 pm
Forum: Garage Talk
Topic: WELL my car blew up
Replies: 20
Views: 4007

Re: WELL my car blew up

I recommend a pre-2013 Subaru Forester. I bought a 6 month old used 2012 three years ago. Put gas in one end and oil in the other, doesn't get more reliable than that. I did have to replace the original battery recently. Lasted 3 1/2 years--put in a 5-year guaranteed Canadian Tire battery. (Canadian...
by David Root
Fri Apr 15, 2016 8:05 pm
Forum: Garage Talk
Topic: Sorry to bother you computer gurus again....
Replies: 7
Views: 1587

Re: Sorry to bother you computer gurus again....

I tried it first but it seemed a bit clunky so I went for the full Outlook as I was already used to it.
by David Root
Thu Apr 14, 2016 10:31 pm
Forum: Garage Talk
Topic: Sorry to bother you computer gurus again....
Replies: 7
Views: 1587

Re: Sorry to bother you computer gurus again....

Thank you!! I knew it was something dead simple and that was it!
by David Root
Thu Apr 14, 2016 8:41 pm
Forum: Garage Talk
Topic: Sorry to bother you computer gurus again....
Replies: 7
Views: 1587

Re: Sorry to bother you computer gurus again....

Yes, you're right. I bought Outlook 2016.
by David Root
Thu Apr 14, 2016 7:09 pm
Forum: Garage Talk
Topic: WELL my car blew up
Replies: 20
Views: 4007

Re: WELL my car blew up

I stopped buying used "refurbished" computers for the same reason.
by David Root
Thu Apr 14, 2016 7:08 pm
Forum: Garage Talk
Topic: Sorry to bother you computer gurus again....
Replies: 7
Views: 1587

Sorry to bother you computer gurus again....

...but I have a small problem developed on my new computer. Windows 10. When I try to reply to an incoming email, the reply body shows a tiny tiny illegible copy of the incoming, and will not allow me to enter anything to reply. Also does it on new email selection too. There is also a small dot ente...
by David Root
Tue Apr 12, 2016 7:07 pm
Forum: Garage Talk
Topic: Home Baked Real Bread!
Replies: 27
Views: 8183

Re: Home Baked Real Bread!

Sorry, double post.
by David Root
Sat Apr 09, 2016 3:02 am
Forum: Garage Talk
Topic: Computer Problem--Help Appreciated
Replies: 12
Views: 2062

Re: Computer Problem--Help Appreciated

Sorry double post somehow.
by David Root
Sat Apr 09, 2016 3:01 am
Forum: Garage Talk
Topic: Computer Problem--Help Appreciated
Replies: 12
Views: 2062

Re: Computer Problem--Help Appreciated

I could not resurrect it y'day, power is permanently gone, so today I went to Best Buy and got a new one. ASUS K31. Also bought Outlook 2016. All works great now except I have to rebuild our email address book, and download all my files from my external drive, so I won't lose all that TAG info and m...
by David Root
Wed Apr 06, 2016 10:30 pm
Forum: Garage Talk
Topic: Computer Problem--Help Appreciated
Replies: 12
Views: 2062

Re: Computer Problem--Help Appreciated

It's been on for seven hours now. I just moved the case a bit to check the caps and it lost the signal but the power stayed on. Shouldn't do that I would think? Caps look OK. The repair shop I took it to said that no generic PS would connect as the "connections are also proprietary to Dell". Origina...