Mail Archive Search: <+subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[Amps\]\s+ALPHA\s+77\s+SX\s+UPDATE\s*$/>

Results:

References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[Amps\]\s+ALPHA\s+77\s+SX\s+UPDATE\s*$/: 12 ]

Total 12 documents matching your query.

1. [Amps] ALPHA 77 SX UPDATE (score: 1): Author: K8MLM@aol.com (K8MLM@aol.com); Date: Tue, 20 Aug 2002 20:47:49 EDT; I finally really checked out the tubes on the ALPHA 77 SX. Initial ohm meter reading of filaments showed a very low resistance ... less than 2 ohms but something didn't seem right. Applied 5 vac fila; /archives//html/Amps/2002-08/msg00170.html (8,075 bytes)
2. [Amps] ALPHA 77 SX UPDATE (score: 1): Author: namidzich@wi.rr.com (noll amidzich); Date: Tue, 20 Aug 2002 22:11:03 -0500; Bob, Try K9AU, Frank Stelloh. email: frank.stelloh@med.ge.com or phone 920-625-3211 or cell phone 262-370-5018. I have purchased 8877's from Frank and have found him to be honest and reputable. 73 No; /archives//html/Amps/2002-08/msg00172.html (9,181 bytes)
3. [Amps] ALPHA 77 SX UPDATE (score: 1): Author: 2@vc.net (2); Date: Wed, 21 Aug 2002 05:43:44 -0700; I have seen the open heater phenomenon in kaput 8877s that were used in amplifiers that ran one side of the heater at gnd potential. If you don't have a free supply of 8877s, it might be a good idea; /archives//html/Amps/2002-08/msg00174.html (9,278 bytes)
4. [Amps] ALPHA 77 SX UPDATE (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.co.uk (Ian White, G3SEK); Date: Wed, 21 Aug 2002 14:05:36 +0100; Two tubes also have double the input capacitance and half the input impedance, so the feedback situation remains the same. If the grid is nailed down firmly - VHF-style, using multiple contact finger; /archives//html/Amps/2002-08/msg00177.html (8,753 bytes)
5. [Amps] ALPHA 77 SX UPDATE (score: 1): Author: w5lu@hotmail.com (S. J. Blackwell); Date: Wed, 21 Aug 2002 13:46:23 +0000; Glad to see the recommendation for the clamping diode to ground on the choke. Without this, the path to ground is through the filament winding on the transformer. In the Alpha amps this may cost more; /archives//html/Amps/2002-08/msg00178.html (8,867 bytes)
6. [Amps] ALPHA 77 SX UPDATE (score: 1): Author: 2@vc.net (2); Date: Wed, 21 Aug 2002 20:33:29 -0700; ** Ian -- How do you explain that 2, 3-500Z amplifiers have a greater reputation for squirreliness than 1, 3-500Z amplifiers? ** So why did the gold-plating on the 8877's grid boil off in Figure 24; /archives//html/Amps/2002-08/msg00186.html (9,123 bytes)
7. [Amps] ALPHA 77 SX UPDATE (score: 1): Author: 2@vc.net (2); Date: Wed, 21 Aug 2002 20:33:33 -0700; What is the source, availability, rating and cost of a suitable gaseous clamping device.? What is the failure mode ? Would such a device not fire fire from the RF potential at the cathode ? - R. L.; /archives//html/Amps/2002-08/msg00187.html (9,270 bytes)
8. [Amps] ALPHA 77 SX UPDATE (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.co.uk (Ian White, G3SEK); Date: Thu, 22 Aug 2002 08:34:12 +0100; "Reputation for squirreliness"? Right, so you're looking for a real in-depth technical analysis here... If we've learned one thing on this list, it is that there's a huge range of variability between; /archives//html/Amps/2002-08/msg00190.html (10,472 bytes)
9. [Amps] ALPHA 77 SX UPDATE (score: 1): Author: 2@vc.net (2); Date: Thu, 22 Aug 2002 06:39:04 -0700; Squirreliness = marginal VHF/UHF stability. Agreed, however, more feedback-C is hardly good news because it is built into the tube and it is not adjustable. Multi-tube amps also have multiples of th; /archives//html/Amps/2002-08/msg00199.html (11,514 bytes)
10. [Amps] ALPHA 77 SX UPDATE (score: 1): Author: 2@vc.net (2); Date: Thu, 22 Aug 2002 06:38:01 -0700; Squirreliness = marginal VHF/UHF stability. Agreed, however, more feedback-C is hardly good news because it is built into the tube and it is not adjustable. Multi-tube amps also have multiples of th; /archives//html/Amps/2002-08/msg00201.html (11,503 bytes)
11. [Amps] ALPHA 77 SX UPDATE (score: 1): Author: n7rt@flash.net (Hardy Landskov); Date: Thu, 22 Aug 2002 19:37:53 -0700; Hi Ian and Everyone, Just wanted to put in my 2 cents worth. The Alpha 77 was a nice amplifier until things went dreadfully wrong. I have modified two Alpha 77's to SX types. The amp works great on 1; /archives//html/Amps/2002-08/msg00214.html (8,159 bytes)
12. [Amps] ALPHA 77 SX UPDATE (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Thu, 22 Aug 2002 22:32:04 -0500; I have been there, done that also, Hardy....in addition to your list: The tank circuit was designed for a Q of 10-12 with an anode Z of 2200 ohms. Putting two tubes in lowers the Z to 1200 ohms or s; /archives//html/Amps/2002-08/msg00215.html (9,745 bytes)

Current List: 1 - 12
Page: [1]