I've been following the thread and have an observation which I haven't seen anyone else mention. Most professional linears (or up-market amateur units) have a rated rf output the same as the anode di
I recall being told that with Loran, the phase comparison was done on one of the cycles in the early part of the pulse (perhaps the 6th cycle?) so as to avoid the effects of the multipath which woul
Sorry forget the above comment - this applied to the 100kHz Loran - not the 160m version. David G4FTC _______________________________________________ Amps mailing list Amps@contesting.com http://lis
One of the problems with trying to build a multi-tube amp using tubes of unknown and variable characteristics is keeping the tubes balanced. To build an effective multi-tube amp would really require
Besides I always thought that the established tube manufacturers gave a warrenty based upon the number of hours of antipated tube life. i.e if the manufacturer gave a warrenty of say, 20,000 hours f
I'm wondering if this is a wideband amp (instanteous wideband as opposed to wide tuning range) with the tubes connected to what is effectively a delay line. The photo of the anode compartment seems
From: "Robert B. Bonner" wrote Well the amplifiers where where air blew sideways across the tubes and pins instead of through the sockets or didn?t have enough airflow due to NOISE CONCERNS developed
Big snip You may be surprised that Hydrogen is used as a coolant - often in very large alternators such as would be found in a power stations! Regards David G4FTC ___________________________________
"Harold Mandel" wrote David is entirely correct! Many of the nuke plants I've worked in use liquid hydrogen on the main dynamo. Often these are turning at around 12,000RPM. Well, men, get the Lithium
More so when mixed with a measure of malt, a measure of hops, some yeast, then allowed to stand for about 10 days, bottled and left in the fridge for at least 6 hours. That's how I prefer my cooling
Often refered to as an "807" - which conveniently brings back On Topic to the subject of Amplifiers (for the benefit of the List Administrator!) David G4FTC _________________________________________
Not phishing - he's not asking for your credit card details - its just a straight forward Scam! It would be interesting to take him up on his offer and get him to send a photo. Or even better ask hi
This is a question I've also asked myself. with a flux density of up to about 1.5 Tesla at 50Hz. Perhaps another reflector member can correct me one way or the other. Regards David G4FTC ___________
From: Manfred Mornhinweg wrote The question now is very simple: For an 8kVA transformer, using common inexpensive standard 0.5mm thick silicon steel laminations (no Hypersil nor anything like that),
I've also experienced short life-times with some CFLs I installed about 5 years ago. Probably no more than a few hundred hours of operation, far less than an incandescent bulb and certainly far less
I recommend the EBM range of blowers. For my 2m W6PO amplifier I used a EBM G2E120-AR77-01. This is flange mounting and air filters are available. This is larger than what would normally be required
Following on from my earlier posting, I've just realised the OP is in Canada, and for 60Hz operation the correct EBM blowers should be prefixed with an R, i.e. R2E 085-AA 01-05, R2E 120-AR 77-05 etc
From: "jeremy-ca" Looking thru the EBM site I find no listings for the R2E series below 133. Are the ones you mentioned discontinued? www.ebmpapst.us/index.asp I took the data/part numbers for my ori
I've never dismantled a 8877, but in other external anode tubes that I've dismantled, that cap is only decorative - underneath is the "pinch off" where they evaculate the tube during manufacture. Reg
It wouldn't be patentable, not at least here in the UK. Here one of the conditions for obtaining a patent is that details of the invention have not been previously published before submission of the