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Author Topic: 811A TUBES GLOWING BRIGHT ORANGE DURING SLOW CW-TOO MUCH OR OK?  (Read 4680 times)
G3RZP
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Posts: 1315




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« Reply #15 on: March 13, 2017, 04:29:34 PM »

While totally agreeing about 811 and 811A ratings and plate colour, it's interesting how many of us have run 807s and 1625s - which have 30 watt ICAS dissipation - with plates glowing bright red on CW for relatively long periods of time - like months. Of course, when they were as low in price as 4 for $1, it didn't really matter! Happy days...

35Ts, OTOH, were supposed run with the plate bright orange....
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VE3LYX
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« Reply #16 on: March 15, 2017, 03:02:30 PM »

Mine glow. I have only 2 811As. Between orange and red. So far (several years) ok. If they die its 572B s
donVe3LYX
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VK3BL
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« Reply #17 on: March 18, 2017, 09:06:11 PM »

Given Frank is polite and Frankly I can be grumpy, I'm interested to know how he's going with his amplifier and tubes, if I didn't scare him off Smiley
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J.D. Mitchell BA  - VK3BL / XU7AGA - https://www.youtube.com/ratemyradio - Honesty & Integrity
KM1H
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Posts: 5512




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« Reply #18 on: March 19, 2017, 05:34:50 PM »

While totally agreeing about 811 and 811A ratings and plate colour, it's interesting how many of us have run 807s and 1625s - which have 30 watt ICAS dissipation - with plates glowing bright red on CW for relatively long periods of time - like months. Of course, when they were as low in price as 4 for $1, it didn't really matter! Happy days...

35Ts, OTOH, were supposed run with the plate bright orange....

I seldom got into those little tubes and then at only 400-450V and then with a modified GG 1625 driving 4 more at about 1000V on SSB only using a 10A exciter with a 20M coil pair plugged in. After awhile I got the drive and audio under control, the meters werent wiggling so much and the HQ-129X sounded a lot better.

Later I worked with 100 and 250TH's, 304TL, and 6C21 run as a 450TL....lots of anode color as amps and modulators.

My favorites were the 4-1000A single and two tube amps I built to order over almost two decades when AM BC pulls were available free from local stations. When station owners went with contract service on demand and canned the Chief Engineers those sources went away. With 4200-5200V they lit up nice on AM, SSB , CW linear service.

A well known ham in MA used a 32S2 & 30L1 to drive PP 750TL's with 7500V on 75 SSB in the early 60's. With a Lazy H between two tall towers he would ragchew with EU and VK/ZL for hours and own the frequency.

Carl
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K9MOV
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« Reply #19 on: March 25, 2017, 06:14:02 PM »

KM1H, Carl-- great memories.
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WA4JQS
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« Reply #20 on: March 25, 2017, 06:20:22 PM »

304TL's that brings back a lot of fun times.. i ran those also after i left the pair of 813's and went to a pair of 833a's in the final and a pair in the mod section.
loved the radio station pulls back then also..
73 Tony WA4JQS.
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