Chris, Nobody is answering so I'll have a go. If I muck up the arithmetic others will be quick to cut me off at the knees :-) I make the max flux density around 160mT (1600 Gauss). If you can't be bo
Chris, Buy Fair-rite toroids from mouser.co.uk (post free over, I think, £20 or maybe £25), or uk.rs-online.com who are always post free. Both add VAT to their catalogue prices. The pros don't use de
From: Manfred Mornhinweg <manfred@ludens.cl> I have the same problem right now, only that I have it at least 18 times. I'm looking for capacitors suitable for a set of legal-limit low pass filters. T
I'm looking for a sanity check on some calculated ceramic tube exhaust air temperatures predicted by the data sheets. Given the blower inlet temperature, the Specific Heat of air (Cp) and the rate of
Eimac's recommendation for fault protection http://www.cpii.com/docs/library/9/AB17%20Fault%20Protection.pdf suggests fragile tubes (I guess 8877?) need the energy in a flashover to be limited to 4 J
I need one or more IXZ210N50L2 FETs as spares for a homebew project. As far as I can tell, after the take over by Littelfuse, ISYS is no longer making RF power FETs. The mainstream suppliers seem to
The datasheet for the Russian GI7B triode says the maximum anode voltage for "continuous wave generation" is 2.5KV, so about 5KV peak. However the rating is 12KV for pulse operation. Flashover would
More armchair theory... Rich Measures (SK) wrote extensively about this last century for "tubes with handles". The "trick" is to use a roller coaster coil in the grid circuit to resonate with the Cin
I just shipped an Eimac 8877/3CX1500A7 date code 1981 from England to Northern Ireland. I used a genuine Eimac foam filled box. it arrived with an open circuit heater. Is this a common failure? Are t
He is returning the tube for me see for myself. And yes, I know the date code on the one I sent him :-) 73, Alan G3XAQ -- Alan Ibbetson alan@g3xaq.net _______________________________________________
The guy sent the open-heater 8877 back. Yes, the heater is open and yes, it is the tube I sent him (date code and serial numbers match). So maybe the valve really was broken in transit. One final que
Does anyone have a GM3SEK Tetrode Board kit or bare PCB lying forgotten at the back of a drawer? If you have one please let me know your price. Thanks, Alan G3XAQ -- Alan Ibbetson alan@g3xaq.net ____
Grid driven tetrode linear amplifiers lend themselves to broadband input circuits using a swamping resistor and, say, a pi section low pass filter that absorbs the grid-cathode capacitance. Svetlana