Somebody asked a while back abt the need for parasitic suppressors' on a GG- 813 amp. A buddy had one blow up on his 2 x 813 amp last yr.. across town. he tossed both the blown one.. and also the rem
Hi Jim, So VERY many guys who are running 813s like that, now being "...outted"!!! My, my... These days, it seems, NOBODY wants to get caught admitting that they run these venerable old jugs. Good fo
I'm not sure what your talking about/going off about....? Lots of discussion here about using 813s for amplifiers. You are correct. They are a economical way to go. I'm not sure credit cards have any
Many transmitters were built with out parasitic suppressors during WWII using 813. I believe it is because the gain drops quickly above 30MHz and there is less of an opportunity for the tube to oscil
The 813s are similar to the 572Bs But at 3kV plate voltage have a bit more power gain at HF frequencies in GG operation. 73 Bill wa4lav ________________________________________ From: amps-bounces@con
Oh, yes , I used a pair in my first amplifier I built in the 60's I was a teenager then. 73 Bill wa4lav ________________________________________ From: amps-bounces@contesting.com [amps-bounces@contes
Hmmm.....If it didnt have stability problems but it had suppressors how can you claim it didnt need them?? If most any amp never gets off the low bands it likely can get away without suppressors. OT
What is the parasitic frequency of the 813? Since they have good gain to at least 6M there is no reason to assume they are parasitic free. Carl KM1H _______________________________________________ Am
Hi Jim, What I meant to say was simply this: in ye olden golden daze, times were tough & money tight--so Hams had to use their smarts & innovate / modify / save money... But these days, credit is so
I was the one that asked. I have to admit that I haven't made a decision as to whether to use GG or grounded cathode. Since I'm planning to run it class C, I will have to lift the grids from DC groun
** Say what? All that tells me is you are not designing the suppressor for the tube. I'm also going to have a small inductance ** Nobody says that on here. Ive been running 4 of them that way for se
Is it a traditional grid-driven circuit with a link-coupled parallel-tuned input? Or do you use something else? I'm interested in the input circuit, and in how to get a decent SWR, since I will be dr
Swamped grid input driven by a Viking II CDC. Tubes are submounted with the shells grounded to the chassis. No neutralizing necessary but I do use plate and grid parasitic suppressors. Carl KM1H ____
"I've had aluminum covers bent for Amp Supply....." Would it be worth it to have a new top made for my LK-500ZB? Randy AB9GO Confidentiality Notice: This e-mail message, including any attachments, is
Carl, that just means you're not driving them hard enough <:-)) It probably means you won't have that output coax short either. I'd say back when I was in business the largest number of problems I fi
Only if you are having problems. With the No Tune versions it is a royal PITA to do the alignment with that d**n steel cover. Carl KM1H _______________________________________________ Amps mailing li
Got ya. I suppose that @ the factory they had a "special" cover with holes drilled in strategic places? Or maybe even a door to allow access while tuning? I used to have a jig to align Motorola pager
A special cover bit was still a PITA alignment process. I watched them doing it a few times when I was doing some consulting work on other items. Carl KM1H Got ya. I suppose that @ the factory they h