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1. [Amps] 813 No parasitics (score: 1): Author: vk3ym at iprimus.com.au (Rick Cole VK3YM); Date: Mon Mar 17 13:32:40 2003; Skip.. I am very interested in your remark about the 813 tube...Can you enlighten me...very briefly..as to the reason for lack of parasitics..what makes the 813 so stable as compared to other/similar; /archives//html/Amps/2003-03/msg00644.html (7,593 bytes)
2. [Amps] 813 No parasitics (score: 1): Author: nagato at arnet.com.ar (GGLL); Date: Mon Mar 17 21:54:49 2003; Ok, you asked Skip; but let me suggest or better saying, ask, could be the 30 MHz highest frequency for full ratings?, or maybe at lower ratings you could have parasitics also?. Best regards Guillerm; /archives//html/Amps/2003-03/msg00656.html (8,299 bytes)
3. Fw: [Amps] 813 No parasitics (score: 1): Author: nospam4me at juno.com (skipp isaham); Date: Tue Mar 18 01:00:19 2003; Hi Rick, - I don't have a single reason that you might be looking for. It's probably a combination of the tube geometry, anode and internal C values and it's HF/VHF gain. I've been able to get 813's; /archives//html/Amps/2003-03/msg00660.html (8,375 bytes)
4. [Amps] 813 No parasitics (score: 1): Author: w8ji at contesting.com (Tom Rauch); Date: Tue Mar 18 06:08:17 2003; As a general rule the most difficult to stabilize tubes are tubes with low upper frequency limits. The grid and anode leads inside such tubes are usually thin and long. 73 Tom; /archives//html/Amps/2003-03/msg00661.html (7,760 bytes)
5. [Amps] 813 No parasitics (score: 1): Author: 2 at vc.net (rlm); Date: Tue Mar 18 08:27:49 2003; The 811A & 572B being examples. On the other hand, G-G triodes with a low-L grid that have substantial VHF gain can also become squirrely in HF amplifiers. The 3cx1500A7, 3cx3000A7 and the 3cx6000A7; /archives//html/Amps/2003-03/msg00664.html (8,751 bytes)
6. [Amps] 813 No parasitics (score: 1): Author: 2 at vc.net (rlm); Date: Tue Mar 18 08:28:22 2003; A grid-driven 813 has 0.2pF of (output-input) feedback-C, and even less feedback-C in G-G configuration with both grids grounded.. This is similar to the feedback-C of modern tubes which have 4 to 1; /archives//html/Amps/2003-03/msg00666.html (9,413 bytes)
7. [Amps] 813 No parasitics (score: 1): Author: msole at loxinfo.co.th (Martin Sole); Date: Tue Mar 18 09:36:06 2003; Okay, I'll buy this one. But I have a question. Wouldn't the low pass filters in the radio have some effect on reducing higher frequency energy from getting at the PA? Martin The 811A & 572B being ex; /archives//html/Amps/2003-03/msg00668.html (9,513 bytes)
8. [Amps] 813 No parasitics (score: 1): Author: 2 at vc.net (rlm); Date: Tue Mar 18 10:51:45 2003; I would think so. However, there have been more than a few reports of this occurrence with solid-state radios. Perhaps the reason is that Chebyshev and Butterworth band-pass filters used in solid-sta; /archives//html/Amps/2003-03/msg00674.html (10,482 bytes)
9. [Amps] 813 No parasitics (score: 1): Author: on4kj at skynet.be (on4kj); Date: Tue Mar 18 17:16:17 2003; 813's You transfered me back in the fifties TOM Are these valves still available or used ? Remember I had a TX on board " Algerine Minesweeper " 6V6 gt as an ocillator, 807 gt as a driver and 813 in; /archives//html/Amps/2003-03/msg00686.html (8,909 bytes)
10. [Amps] 813 No parasitics (score: 1): Author: w8ji at contesting.com (Tom Rauch); Date: Tue Mar 18 20:21:15 2003; They sure would. It is pretty simple to see that lower frequency energy from an arc or flashover caused by outgassing in the tube would make it through all the low-pass filters right up to the PA. V; /archives//html/Amps/2003-03/msg00689.html (7,952 bytes)
11. [Amps] 813 No parasitics (score: 1): Author: w8ji at contesting.com (Tom Rauch); Date: Tue Mar 18 20:36:18 2003; You can still find them in old US military surplus gear, and in some old boat-anchor gear.; /archives//html/Amps/2003-03/msg00690.html (7,911 bytes)
12. [Amps] 813 No parasitics (score: 1): Author: 2 at vc.net (rlm); Date: Tue Mar 18 21:00:38 2003; The filters are bandpass filters. Shorted capacitors pass everything. - R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2003-03/msg00693.html (8,030 bytes)
13. [Amps] 813 No parasitics (score: 1): Author: garyschafer at attbi.com (Gary Schafer); Date: Tue Mar 18 21:04:40 2003; Wouldn't a VHF oscillation also cause a large low frequency current pulse the same as an arc would? 73 Gary K4FMX; /archives//html/Amps/2003-03/msg00696.html (8,248 bytes)
14. [Amps] 813 No parasitics (score: 1): Author: w8ji at contesting.com (Tom Rauch); Date: Tue Mar 18 21:15:26 2003; Why would it cause a pulse Gary??? Think about where the current comes from. The current all comes from cathode emission. Current is limited by emission unless the tube has enough gas or some other; /archives//html/Amps/2003-03/msg00697.html (8,586 bytes)
15. [Amps] 813 No parasitics (score: 1): Author: kc4slk at csrlink.net (Mike Sawyer); Date: Tue Mar 18 23:04:44 2003; Yes and you better hurry since I'm cornering the market on them ;>) My RCA MI-8167F uses a pair, my Hose Nose 500 uses a pair and my HB-2X813 uses a pair. Mike(y) W3SLK -- Original Message -- From: "; /archives//html/Amps/2003-03/msg00698.html (8,665 bytes)

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