Patrick, The 4-1000A and the 304TH rig sounds great, and will be fun to operate. I built a rig with the same tube compliment, however... I use 304TLs to modulate the 4X1. The TL version of the 304s will give you better linearity, but you will need to lower the bias voltage since these have a bit more gain and will need less audio drive level. I run the whole thing very conservative at 2800VDC and get 750 Watt+ carrier 80-10M, and 125% modulation with the Stancore 600W polypedance tranny and a heising connection. You may want to consider the 3-Diode negative peak loading circuit with the "keep-alive" power supply to protect the mod-tranny from 100% negitive modulation. E-mail back and we can chat if you like, since we basically have the "same rig". George AB2KC
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Mike Dorworth K4XM Sent: Friday, June 06, 2003 8:05 AM To: [email protected] Subject: Re: [AMRadio] big iron AM rig built by silent key Durwood Tucker I'm looking for any information on a transmitter I rescued. It uses a 4-1000A modulated by a pair of 304TH's and the HV meters read to 5000 volts....................... I don't know how much power it is capable of but I am sure it is 'enough'. Patrick ............................. Placed in perspective of a Collins 30K1, it has 4 times the audio, and 875 watts more plate dissipation in the final tube, yeah! a conservative rated rig! mike, k4xm --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.487 / Virus Database: 286 - Release Date: 06/01/2003 _______________________________________________ AMRadio mailing list [email protected] http://mailman.qth.net/mailman/listinfo/amradio
