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1. [AMPS] More on the SB220 (score: 1): Author: wfairclo@netcom.ca (Walter Fairclough); Date: Thu, 18 Mar 1999 10:31:43 -0500; Checked out the SB-220 this morning for damage. The only component that blew was the 0.82 ohm resistor. I noticed that the resistor is of the metal film type with a 2W rating, manufactured by Phillip; /archives//html/Amps/1999-03/msg00411.html (8,619 bytes)
2. [AMPS] More on the SB220 (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 18 Mar 1999 15:48:44 -0000; have transmitter was that the Could it be that you have a 'flash arc' or 'Rocky Point effect'? Although the voltage may be considered low for a glass tube, the effects you describe fit the descripti; /archives//html/Amps/1999-03/msg00412.html (8,438 bytes)
3. [AMPS] More on the SB220 (score: 1): Author: jono@enteract.com (Jon Ogden); Date: Thu, 18 Mar 99 09:51:47 -0600; Don't know why a 2W wirewound would have more dissipation capability than a 2W metal film. I'd put in a bigger wattage value anyhow if that's what keeps blowing. Agreed. Everything bad that happens; /archives//html/Amps/1999-03/msg00413.html (9,140 bytes)
4. [AMPS] More on the SB220 (score: 1): Author: measures@vc.net (Rich Measures); Date: Thu, 18 Mar 1999 08:51:26 -0800; ? To find out whether the 0.82 ohm grid-I meter shunt resistor was damaged by an interelectrode gas flashover or damaged by a parasite, I would high-pot. the tubes at 2x the rated anode potential. I; /archives//html/Amps/1999-03/msg00420.html (9,553 bytes)
5. [AMPS] More on the SB220 (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Thu, 18 Mar 1999 12:04:39 -0500; An arc in a vacuum would not go BANG. Neither would the opening of a 2W resistor. Sounds like a HV breakdown to me that is external to the tube. Off to work; be back in 11 hours.... 73 Carl KM1H ____; /archives//html/Amps/1999-03/msg00424.html (9,873 bytes)
6. [AMPS] More on the SB220 (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Thu, 18 Mar 1999 12:01:31 -0500; Are you sure that one or more of the bias diodes did not short? That is a common failure mode. Heath manual calls I prefer a 2 or 3W metal oxide which can handle momentary overloads without opening a; /archives//html/Amps/1999-03/msg00425.html (10,983 bytes)
7. [AMPS] More on the SB220 (score: 1): Author: measures@vc.net (Rich Measures); Date: Thu, 18 Mar 1999 11:12:28 -0800; ? Also: *Proceedings of the Institute of Radio Engineers*, September, 1935. "PARASITES AND INSTABILITY IN RADIO TRANSMITTERS" by G. W. FYLER, General Electric Company, Schenectady, New York. " ... M; /archives//html/Amps/1999-03/msg00436.html (9,726 bytes)
8. [AMPS] More on the SB220 (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Fri, 19 Mar 1999 00:35:31 +0000; There could have been a silent arc inside the tube, with the bang coming from the resistor. IMO a 2W resistor standing in the way of a near-short across the HV supply is very likely to exit with a ba; /archives//html/Amps/1999-03/msg00462.html (11,260 bytes)
9. [AMPS] More on the SB220 (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Fri, 19 Mar 1999 02:07:12 -0500; I take it that you are not familiar with the SB-220 circuit. The resistor in question is not in the HV path at all. 73 Carl KM1H ___________________________________________________________________ Yo; /archives//html/Amps/1999-03/msg00471.html (10,215 bytes)
10. [AMPS] More on the SB220 (score: 1): Author: measures@vc.net (Rich Measures); Date: Fri, 19 Mar 1999 03:04:26 -0800; you ? I have seen and heard them explode to bits. ? What if the resistor is virtually shorted by a few turns of #16 copper buswire? Rich... R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures; /archives//html/Amps/1999-03/msg00478.html (9,634 bytes)
11. [AMPS] More on the SB220 (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Fri, 19 Mar 1999 14:59:29 -0500; On Fri, 19 Mar 1999 03:04:26 -0800 Rich Measures <measures@vc.net> writes: Not when used in a grid ckt. Virtual what? 73 Carl KM1H ___________________________________________________________________; /archives//html/Amps/1999-03/msg00495.html (10,137 bytes)
12. [AMPS] More on the SB220 (score: 1): Author: w4eto@rmii.com (Richard W. Ehrhorn); Date: Fri, 19 Mar 1999 17:02:03 -0700; Hi Ian... I have no doubt that we saw many "Rocky Point effect" flashovers in the 3CV1500A7 (vapor cooled 3CX1000A7) tubes we used in our first amps - the ALPHA SEVENTY c. 1970. The BANG occurred muc; /archives//html/Amps/1999-03/msg00501.html (13,083 bytes)
13. [AMPS] More on the SB220 (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sat, 20 Mar 1999 00:25:04 +0000; I've heard of both gas inclusions and surface imperfections that might be the same as Eimac's 'barnacles'. Whatever the cause, improvements such as pure, gas-free metals and better processing can cer; /archives//html/Amps/1999-03/msg00504.html (9,670 bytes)
14. [AMPS] More on the SB220 (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sat, 20 Mar 1999 12:03:51 +0000; It's been years since I worked on an SB-220, so I didn't have the circuit handy, but have now downloaded it from Rich's web site (thanks!). R3 is not involved in the normal anode-cathode HV current p; /archives//html/Amps/1999-03/msg00506.html (10,605 bytes)
15. [AMPS] More on the SB220 (score: 1): Author: sm2cew@telia.com (Peter Sundberg); Date: Sat, 20 Mar 1999 21:41:45 +0100; My homebrew 432 MHz EME amplifier uses a Siemens YL1050 tetrode in a grounded screen configuration with the screen voltage B+ grounded. This tube is famous for it's arc-overs and mine was not any dif; /archives//html/Amps/1999-03/msg00512.html (12,064 bytes)
16. [AMPS] More on the SB220 (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Sun, 21 Mar 1999 11:25:25 -0500; AMEN ! On a voltage rating note: I recently had a long chat with K1FO of both amp and antenna fame and found out something interesting. He is using 3CPX800A7's in his 1500W + 70cm and 2M amp products; /archives//html/Amps/1999-03/msg00524.html (11,168 bytes)
17. [AMPS] More on the SB220 (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Sun, 21 Mar 1999 12:04:23 -0500; Correct, but a typical arc in the 220 does not blow apart R-3. In fact the original Heath and the metal film Harbach often show no external sign of failure. So the BANG is not in that part of the amp; /archives//html/Amps/1999-03/msg00526.html (11,986 bytes)
18. [AMPS] More on the SB220 (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Sun, 21 Mar 1999 10:10:02 -0500; On Fri, 19 Mar 1999 17:02:03 -0700 "Richard W. Ehrhorn" <w4eto@rmii.com> writes: Are you saying that an arc in a vacuum will be loud? If so then I certainly have to revise my thinking ! BTW, I need a; /archives//html/Amps/1999-03/msg00527.html (15,159 bytes)
19. [AMPS] More on the SB220 (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sun, 21 Mar 1999 23:40:56 +0000; A normal silicon rectifier diode has no detectable effect on meter calibration at 500mV (I checked with a DMM) but it starts to conduct significantly at around 600mV. That's why it's nice to design t; /archives//html/Amps/1999-03/msg00533.html (10,001 bytes)

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