Hallo, I have been offered two boxed EIMAC 4-500A tubes. I know the 4-400A and gather the 4-500A is a hybrid but with a extra pin and 10V @ 10.2A on filament. Any info will be appreciated especially
Hi all, I was today given two items at a flea market ... "you are the only one I know that will appreciate and use this in you amp projects" I was told. It turns out to be two items with a 4 pin base
I took possession of two brand new boxed EIMAC 4-500 tubes today. For those interested the specs I could find : Dissipation (500 watts) Filament Voltage (10.0 +/- 0.5 V) Current @ 10 V (10.2 A) Ampli
Sam, can you put your hands on a VARIAC @ 1000VA (10A). I use Variacs on all my home built power supplies. That will give you 100V up to whatever you can get out of the supply. You can even then not
Hi, I'm confused now. My main power supply is a 3670 0 3670 NATO transformer with inductive input filter. My mains 220 - 240 volts is supplied to the soft start circuit input through a VARIAC (10A).
Hi William. The transformer is one of two which was originally designed to be used in the power supply of the low frequency transmitter of a submarine. It is built to the highest military standards.
Hey all, I revisited my original design and notebook. The original AMP I built with the 4-1000A has departed to the component heaven many moons ago so I needed to refresh the memory. Off course what
Greetings I am halfway into erecting my first tower. It consists of two commercial 6,5 meter (length) triangular, 450 mm (diameter) galvanized steel sections giving me 13 meters of height plus anothe
Greetings I am halfway into erecting my first tower. It consists of two commercial 6,5 meter (length) triangular, 450 mm (diameter) galvanized steel sections giving me 13 meters of height plus anothe
This is a multi-part message in MIME format. --=_NextPart_000_0005_01C061E6.8B9F0200 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Greetings, I have start
This is a multi-part message in MIME format. --=_NextPart_000_0053_01C06299.6B625A60 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hallo all, THANK YOU VE
This is a multi-part message in MIME format. --=_NextPart_000_0028_01C0524B.34F57420 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I have sourced some Jen
This is a multi-part message in MIME format. --=_NextPart_000_001E_01C053FC.B30E59A0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I have been asked to aw
Various comments on this e-bay listing refer. Looking at the pictures one thought did strike me, notwithstanding the appearance and shoddy construction technique the builder was no dummy. I notice ad
Need help with Diode/Rectifier blocks made by SILEC. There is two type of markings: SILEC F 80 H and in small letter 7509 also SILEC F80 H and in small letters 7511. What will be the voltage and ampe
Hi, My AMERITRON AL811 Grid Meter is not showing any reading although the AMP works fine. The meter tests out OK. Any suggestions on where the fault can be before I start working through the circuitr
James, I use many 4-250A's in my amp building. And I would strongly advise against tilting them. I lost two of them by trying to use them horizontal mounted. You going to put them into a console, how
Hello fellow enthusiasts, I must give support here and echo the sentiment of construction and if that entails using 813's so let it be the case. I have built a few amps getting experience using 813's
I have been hearing claims at the local flea markets here in South Africa that a single 4-250A valve is capable of between 800 - 900 watts in ham band amplifier application. Now I have used these mys