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Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only. |
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4th Jun 2020, 10:32 am | #1 |
Hexode
Join Date: Oct 2006
Location: Edenderry, Republic of Ireland.
Posts: 428
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Pilot H665 radio.
Hi again, I have a Pilot radio I would like to restore, but I have no output transformer or 6U5 Magic Eye. Is the transformer a special to suit the 6F6 output valve or could I use one from a different chassis? Would it be possible to get an EM34 to work instead of the 6U5 (different base)?
Thanks again, Dick. |
4th Jun 2020, 11:54 am | #2 |
Dekatron
Join Date: Feb 2009
Location: Chesterfield, Derbyshire, UK.
Posts: 3,766
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Re: Pilot H665 radio.
Looks like you need a tx with a 7k ohm primary for a 6f6 , depending on the speaker ohms , do you have any transformers , or are looking for one , Mick.
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4th Jun 2020, 8:43 pm | #3 |
Hexode
Join Date: Oct 2006
Location: Edenderry, Republic of Ireland.
Posts: 428
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Re: Pilot H665 radio.
Hi again, In replying to your question, presently I do not have an output transformer or a speaker but I see that the 6f6 can be replaced with a 6v6. I may have a chassis that would have had a 6v6 output valve. Could the output transformer and speaker from that chassis be installed in the H665.
Thanks again Dick |
4th Jun 2020, 10:14 pm | #4 | |
Pentode
Join Date: Nov 2016
Location: Lisbon, Portugal
Posts: 187
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Re: Pilot H665 radio.
Quote:
Cheers. |
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4th Jun 2020, 10:17 pm | #5 |
Dekatron
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 16,536
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Re: Pilot H665 radio.
Yes, if the transformer physically fits. The 6V6 will drop straight in though for optimum performance you might want to tweak the cathode bias resistor.
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....__________ ....|____||__|__\_____ .=.| _---\__|__|_---_|. .........O..Chris....O |
12th Jul 2020, 11:03 am | #6 |
Hexode
Join Date: Oct 2006
Location: Edenderry, Republic of Ireland.
Posts: 428
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Re: Pilot H665 radio.
Hi again, The symbols on the 665 pilot schematic seem to be early American, has anyone come across a translation to the later symbols, pin outs etc. It would be very reassuring if such were available. Also does the dim bulb always light when in circuit. Thanks again Dick.
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12th Jul 2020, 2:49 pm | #7 | |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Pilot H665 radio.
Quote:
Mixer anode (a) Pin 3. Mixer screen grids (g2&g4) Pin 4. Oscillator anode (at) Pin 6. Oscillator grid & mixers oscillator injection grid (gt&g1) Pin 5. Mixer signal grid (g3) Top Cap. Cathode (k) Pin 8. Heater (Not shown) Pins 2&7. Metal shell, pin 1. 6U5....Top to bottom: Target (t) Pin 4. Triode anode (a) Pin 2. Triode grid (g1) Pin 3. Cathode (k) Pin 5. Heater (Not shown) Pins 1&6. 6Q7G....Upper left: Diode anodes (a(d1)&a(d2)) Pins 5&4 (Connected together in schematic) Bottom left: Cathode (k) Pin 8. Next right: Grid (g1) Top cap. Next right: Anode (a) Pin 3. Heater (Not shown) Pins 2&7. ------------------------------------------------------------------------ The other valves should be self explanatory, pin connection data can be found here: https://frank.pocnet.net/ Lawrence. |
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14th Jul 2020, 4:50 pm | #8 |
Hexode
Join Date: Oct 2006
Location: Edenderry, Republic of Ireland.
Posts: 428
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Re: Pilot H665 radio.
Hi, Thank you Laurence for that information, very much appreciated. One other question? There are two shielded capacitors 0.01 each in the one can on the mains coming in. What could I use in modern caps in place? Regards Dick.
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14th Jul 2020, 5:09 pm | #9 | |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Pilot H665 radio.
Quote:
Lawrence. |
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24th Jul 2020, 11:01 pm | #10 |
Hexode
Join Date: Oct 2006
Location: Edenderry, Republic of Ireland.
Posts: 428
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Re: Pilot H665 radio.
Hi again, I am still not sure of the the PIN numbers on the valves. I have included the schematic of the valves but I am not sure of the symbols. Ihave also done a drawing of the valves with letters on the symbols. If ye could put a number to each letter it would be great. Example-: F 6K8=8 etc. Thanks again, Dick.
Sorry I meant to attach as 2 images but my iPad won't let me attach 2 separate images |
25th Jul 2020, 10:38 am | #11 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Pilot H665 radio.
6K8:
A = Pin 3 (a) B = Pin 4 (g2,g4) C = Pin 6 (at) D=Pin 5 (gt,g1) E = TC (g3) F = Pin 8 (k) 6K7: A = Pin 3 (a) B = Pin 5 (g3) C = Pin 4 (g2) E = TC (g1) F = Pin 8 (k) 6Q7: A = Pin 3 (a) B = TC (g) E = Pins 4&5 (a(d2) a(d1)) F = Pin 8 (k) 6F6: A = Pin 3 (a) B = Pin 4 (g2) E = Pin 5 (g1) F = Pin 8 (k,g3) Lawrence. |
25th Jul 2020, 11:55 am | #12 | ||
Hexode
Join Date: May 2005
Location: Greater Manchester, UK.
Posts: 498
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Re: Pilot H665 radio.
Quote:
https://uk.farnell.com/w/c/passive-c...2&sort=P_PRICE I have used the KEMET class Y2 from Farnell in the past, had no issues. Best Regards Chris Last edited by unitelex; 25th Jul 2020 at 11:56 am. Reason: Corrected capacitance value in link |
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25th Jul 2020, 2:46 pm | #13 |
Hexode
Join Date: Oct 2006
Location: Edenderry, Republic of Ireland.
Posts: 428
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Re: Pilot H665 radio.
Hi again, thanks for all the help as always, very much appreciated. Regards, Dick.
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11th Aug 2020, 6:57 pm | #14 |
Hexode
Join Date: Oct 2006
Location: Edenderry, Republic of Ireland.
Posts: 428
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Re: Pilot H665 radio.
Hi again, I still have not got a transformer/speaker to suit the h665. I do have transformers/speakers from other sets and I was hoping that ye might be able to advise m as to what other output valves would be compatable with the 6f6/6v6.I know which transformer is for which output valve. I would only like to get it working if not perfect. The cabinets were beyond repair (all wooden). Regards, Dick.
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11th Aug 2020, 7:41 pm | #15 |
Dekatron
Join Date: Jan 2004
Location: Newcastle upon Tyne, Tyne & Wear, UK.
Posts: 8,195
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Re: Pilot H665 radio.
Hi Dick, for a proving test virtually any op transformer will do and don't turn the volume right up.
If you get it running mail me and I'll see if I can find something suitable (very busy atr present) Ed |
12th Aug 2020, 2:57 pm | #16 |
Hexode
Join Date: Oct 2006
Location: Edenderry, Republic of Ireland.
Posts: 428
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Re: Pilot H665 radio.
Hi again, I have an op transformer from a PYE 15A. It has got just four wires, two primary and two outputs with a third output not used. I have four wires coming to the connector which would have connected to the original output transformer/speaker. I have included a picture of what I am trying to do.This is only for testing purposes. Any help would be very much appreciated. Regards, Dick.
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12th Aug 2020, 3:20 pm | #17 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Pilot H665 radio.
Pins 1&2 to A&B (any way round)
Pins 3&4 to a 1.2k 10 Watt resistor. D&E to a suitable loudspeaker. Lawrence. |
12th Aug 2020, 3:38 pm | #18 |
Hexode
Join Date: Oct 2006
Location: Edenderry, Republic of Ireland.
Posts: 428
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Re: Pilot H665 radio.
Hi Lawrence, Do pins 3&4 join the resistor at one end and does it then go to chassis?, Thanks again Dick.
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12th Aug 2020, 3:43 pm | #19 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Pilot H665 radio.
One end of the resistor connected to pin 3, the other end of the resistor connected to pin 4 so that it's in series with the HT feed to the rest of the circuit, it's to replicate the resistance of the missing loudspeakers field coil.
Lawrence. |