[Drakelist] Running R4A off car inverter
I'm still interested in running the Drake R4A of a DC/AC inverter. I found a Xantrex Pro Watt 600 watt. These are getting pricey, some hundreds of dollars. Will they work? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] What makes up the front end
Exactly what components constitute the front end of the R4A? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] PTO clicking
What is the clicking sound I hear when the R4A PTO is tuned past the 0 and 500 Khz? Is this a mechanical warning not to tune so close to the edge of travel? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Overload
I located a crystal to cover 1 to 1.5 Mhz, below preselector range for my Drake 4A. Some MW stations are tunable down to 1.3 mhz, but there a few very strong broadcasters just under 1.5 Mhz and I hear a lot of static crashing. Is the front end overloading? I realize an AM table radio is only a few dollars, but it is convenient to tune them in on the R4A. ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Passband tuner hard to turn
The pass band tuner on my R4A grinds a little when I turn it for about 20% of the 360 degree range. Any idea what is wrong? Typically this happens after a lot of use. ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Please standby
The standby mode on the R4A isn't really electrically standby is it? It seems to be only an audio muting. ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Passband tuner
What is the range in khz of the R4A passband tuner? Is there a range in khz like a fine tuning? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] What if...
Exactly what will happen if you use a crystal below 11.1 in an R4A? Will it tune anything? Don't ask why. (-: ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] faceplate
Are there absolutely original face plates available for the R4 series, or are they all of recent manufacture? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Upconverter
What is the model number of the Drake upconverter for using medium wave crystals in the 4 series? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Variac
When bringing up a radio on a variac, do I slowly continuously turn the power up or go step by step? I've never used one. ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Receiver protection lamp
What is this???: http://www.ebay.com/itm/RL-Drake-Receiver-Protection-Lamp-4-Line-Receivers-/360399257957?pt=LH_DefaultDomain_0hash=item53e9784165 ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Capacitors near PTO
The capacitor can near the PTO on my R4A is silver with the name Sagamo on it. Is this a replacement for the original? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] R7 crystals
Sorry to interrupt, but does the R7 aux board use the R4 crystals or the SPR4 crystals? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Will this crystal work?
I found a crystal that looks like an hc6u with the 1/2 inch pin spread, labeled CB crystal, 26.1 mhz. Will it work in an R4A? Link: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=270729147749 ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] R4A versus R8
I pitted my R4a against the R8 and found the R8 hearing signals the R4A missed. A weak signal from Radio New Zealand on 6170 was faint but there on the R8, only static with R4A. is the R8 noted for better sensitivity or noise level? It is a lot newer of course with every bell and whistle. ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] A liitle off, but...
Is an antenna matcher a balun or unun since it matches the antenna to the input impedance? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] A *little off, but...
Is an antenna matcher a balun or unun since it matches the antenna to the input impedance? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Loopy noise
I have the R4A audio going to my stereo amp and a terrible humming from the speakers. A ground loop, do you think? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] New crystal not working
I tried a 11.5 to 12 mhz crystal in my R4A and the radio is hearing nothing. The preselector peaks the static, but at 15 meters instead of 25 and the calibrator does not work. Nearby 31 meters and the ham bands work fine. Could it be the crystal? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Accessory bank for more crystals
Dis I see an accessory crystal bank somewhere for Drake? The bank would hold 10 extra crystals and plug into one of the crystal sockets to provide 20 crystals instead of ten. Is there such a thing? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] ICM for Drake
Did ICM make crystals for Drake, since Drake did not make their own? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Crystals one at a time or a batch
I've been buying Drake crystals one at a time. Is everyone agreed on International Crystal, so I can order a batch of them? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Tired of buying crystal s piecemeal
I've been buying Drake crystals one at a time. Is everyone agreed that International Crystal is reliable, so I can order a batch of them? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Frequency crystals
I saw some crystals made by Hunt. Anyone heard of them? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Crystals and audio
Can a frequency crystal affect the audio quality? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] New or used crystals
Are there any advantages to buying new crystals besides they might last longer? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Growing crystals
Aren't crystals quartz, how do you grow them? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Drake crystals accuracy
Do aging Drake crystals lose accuracy? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Changing crystal frequency
Someone I know used to write on crystals with a pencil claiming the frequency could be changed. Is this true or an urban legend, because graphite is crystalline? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Drake tube txs
Drake tube receivers sound different from solid state but do voice and cw transmissions from tube transmitters sound different on the receiving side? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] R4A AC
What is the optimum AC current for the R4A? Are the 100.00 variacs on Ebay good enough for bringing up Drake tube equipment? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Leaving tube radio on
I use my R4A about 4 hours a day. Should it be left on continuously or is it better to turn the radio off every night? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] AF output tube in R4A
Is the AF output tube in the R4A swappable with the same tube in the 2-B? I Googled but it is not clear. Btw, what is a beam pentode or tetrode? Is 6EH5 in V7 one of these? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Covering 5 to 6 Mhz in R4A
What will happen if I attempt to use a 5 to 6 Mhz (actual coverage) crystal in the R4A? Will there be any reception at all, strange noise or will the radio explode? :) ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Padding below 1.6 Mhz
I am able to tune part of the medium wave band on the Drake R4A, but the stations are weak even though they are powerful nearby broadcasters. I thought I saw that the sensitivity is padded below 1.6 Mhz. Is this true on the Drake? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] FS-4 cable
What cable can be used instead of the original Drake cable for the FS-4 - R4A? Can any crystal socket be used? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] HC6/U
There appear to be two types of HC6/U crystals, parallel and series. Do both work the same when plugged into a Drake? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] HC6/U
Will any HC6/U crystal work in the Drake 4 Line or does the crystal have to be for Drake? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Fading
This is a bit off topic, but how can two receiving antennas be used to reduce fading? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] 4 line crystals
Quick question: Do the R4 and the R4A take the same crystals? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Hc6u crystals
Quick question: Are 4 Line crystals hc6u? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] (no subject)
Continuation from last night: If I attempt to run a R4A from a pure sine wave 130 watt inverter, can I ruin the inverter or just blow a fuse? If it's just a fuse, I give it a try. ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] R4A from car inverter
Continuation from last night: If I attempt to run an R4A from a pure sine wave 130 watt inverter, can I ruin the inverter or just blow a fuse? If it's just a fuse, I'll give it a try. ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] R4A on an inverter
The power consumption of the R4a is 60 watts and I'd like to run the radio off my 12 volt car cigarette lighter using a 130 watt PSW inverter. I think the fuse is 10 amps. So 12.5 volts x 10 amps=125 watts. But I heard of fuses blowing running only laptops. It looks good on paper, but practically will this work? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] About to buy FS-4, but...
I want to take the plunge and buy an FS-4. The Drake Virtual Museum page reads, Complete general coverage, no crystals to buy. When I found the manual it seems to spec only 11.1 to 40 Mhz coverage. I suppose the manual is correct. Where is the emoticon for confused? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] R4 medium wave
Will the R4 series tune medium wave(1-1.5 Mhz)with the appropriate crystal? There is a close band setting for 1.5-3.0 and the preselector seems tune that low. Signals in this range are very strong after all. I don't want to buy an expensive 1.0 Mhz crystal and discover it won't work. Thanks. ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] R4A headphone
Is the R4A headphone jack line level output or amplified output? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Sherwood crystals
Does Sherwood manufacture their own crystals? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Inproved audio amp for R-4C
Does Sherwood or anyone offer an improved audio amp for the R-4C? Does the new amp draw more current? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Sherwood and Inrad
Does Sherwood manufacture their own crystals? Is Inrad a separate entity? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] 2A passband
The 2A has an lsb/usb control on the front panel. Is this true passband tuning? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Adding filtering capacitor
Is there any advantage of adding a large filtering capacitor if there is no issue with the radio? Is a larger capacitor worthwhile and will it result in smoother power? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Sticky finish
What is the dreaded sticky finish paint I read about concerning Drake rigs? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] R4 impedance
What is speaker impedance in the R4 series? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] 6AH6/6HS6
How is the 6AH6 as a substitute for the 6HS6? Does one offer more gain than the other? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] SW4
Has anyone ever seen an SW4 for sale? They seem hard to find. ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Basic electronics
How does a tube amplify AC current if tubes are used to rectify current? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Filter insertion loss
What would the insertion loss be for an 8 pole 8000hz filter compared to a 4 pole 8000hz filter? Would extra amplification be necessary? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] R4A filter location
Where physically in the R4A is the crystal lattice filter? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] R4A/B Push-Pull?
Is the audio in the R4A and R4B push-pull? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Amp
Is the amp in the SW4-A push pull? What about the R4A and R4B? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Amp and output
What is the difference between the AF amp and the AF output? Aren't they both amps? From R4A specs: V6-6GX6 Prod Det/AF Amp V7-6EH5-AF Output ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Crsytals for R-4A
Are SW broadcast band crystals for the R series hard to find? I've seen none on Ebay. ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] R-4 series freq display
Do digital freq. displays for the R-4 series actually work? Where do they plug in? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] 8 Pole filter
For AM listening would a 5 khz 8 pole filter be too steep? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] (no subject)
It depends. If there are interfering stations nearby, it would help to have a narrow filter. If clear conditions, an 8 kc filter would improve the fidelity. Do you mean an 8 pole filter or an 8 khz filter? Why would 8 pole be 8 kc? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] 8 Pole filter
It depends. If there are interfering stations nearby, it would help to have a narrow filter. If clear conditions, an 8 kc filter would improve the fidelity. Do you mean an 8 pole filter or an 8 khz filter? Why would 8 pole be 8 kc? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] 8 pole filter
Why is an 8 pole 5 khz filter better than a 4 pole, since they're both 5 khz? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] 2-AQ
Does the 2-AQ Q multiplier work in the audio or IF stage? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] (no subject)
All Drake Q-multipliers worked with the IF frequency. The q-multiplier cabinets also typically had a speaker in them for the rig. Was a cable run from the 2-AQ to the receiver? Where did it plug in? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] 2-AQ
All Drake Q-multipliers worked with the IF frequency. The q-multiplier cabinets also typically had a speaker in them for the rig. Was a cable run from the 2-AQ to the receiver? Where did it plug in? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] 2-AQ
Can the 2-AQ be used with the R series? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] R-4C amp
Does the R-4C have a class A amp? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] R-4C amp
Is it true that the R-4C uses a class A amp? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Weighted knobs
Where can I find weighted knobs for Drakes and other radios? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] R-4C roofing filter
Can someone explain the Sherwood roofing filter mods? Can you select the bandwidth of the filter? Is the CF-2K/8 the only filter available? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Roofing filter in R-4A
Where in the schematic would you find a roofing filter? After the first mixer, for example? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Roofing filter
Where in a schematic would a roofing filter be located? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Roofing filter
So is the purpose of the roofing filter simply to make the final selectivity easier to accomplish with less interference getting through the final filter? Also, it seems the final bandwidth could not be wider than the roofing filter's. ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] PTO/VFO
Is there any difference between a PTO and a VFO? The R-4 has a PTO and the R-4A a VFO per the specs. ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] R-4A VFO
Is stability the only advantage to the R-4A's semiconductor VFO? Is there any hum, like that from a freq. synthesizer, from solid state VFO? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Sherwood filter
Does anyone know about this Sherwood filter: SD-5K/8 IF filter? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Sherwood filter
Does anyone know about this Sherwood filter: SD-5K/8 IF filter? Is it a roofing filter? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Roofing filter for R-4A
Does anyone know about this Sherwood filter: SD-5K/8 IF filter? Is it a roofing filter ? Yes, it is a roofing-filter. Bill W6FF What impact does this filter have on the selectivity of an R-4A since the later filters determine the bandwidth and I prefer a wider skirt for AM reception? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Schematic R-4A
Can someone link to a schematic of the R-4A? Get your own web address. Have a HUGE year through Yahoo! Small Business. http://smallbusiness.yahoo.com/domains/?p=BESTDEAL ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Antenna jack on R-4A
What impedance is the antenna connection on the R-4A? How can I attach a long wire? Btw, the schematic is fine. Thx. ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] R-4 serials
Do the R-4 receivers share the same run of serial numbers, the R-4's the lowest and the R-4C's the highest? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Repair R-4A
Who would anyone suggest to repair/restore the R-4A if I don't have the time or expertise? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] R-4A amplifier
Can audio be feed out of the R-4A bypassing the onboard amplifier? Can a better amplifier be installed? Does someone do this mod? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] R-4A Recap
Should I recap my R-4A no matter what just because it is 30 years old? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] R-4A passband
Does the R-4A passband tuning function in AM mode? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Switching crystals
Can the 4.8 Khz filter in the R-4A be switched with a wider filter for AM? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] R-4A product detector
For the R-4A which serial numbers have a tube product detector? Are they all the 13 tube versions? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
