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| sent on March 01, 2020 (16:47) | This comment has been automatically translated (show/hide original)
He's !!! You're great! The ssbs were very complicated ! And to calibrate it like you did ??? L'ha PROGETTATO !!! Sei un grande ! Gli ssb erano complicatissimi ! E per tararlo come hai fatto ??? |
| sent on March 01, 2020 (17:06) | This comment has been automatically translated (show/hide original)
@Jacopo - I'm an engineer and a guy from electronics and photography.... in the house I got a fairly equipped lab @Jacopo - Sono ingegnere e appasionato fin da ragazzo di elettronica e fotografia.... in casa mi sono ricavato un laboratorio abbastanza attrezzato |
| sent on March 01, 2020 (17:18) | This comment has been automatically translated (show/hide original)
@Jacopo - The calibration is not complicated... just have a good RF oscillator (stable) with a reliable frequency meter.
Of course, you have to have the other irons of the trade to complete. @Jacopo - La taratura non è complicata... basta avere un buon oscillatore RF (stabile) con un frequenzimetro affidabile.
Ovviamente per completezza bisogna avere anche gli altri ferri del mestiere. |
| sent on March 01, 2020 (18:12) | This comment has been automatically translated (show/hide original)
And I feel cool if I fix a tube radio.
Those who know how to design a transceiver from scratch and not even AM, EVEN SSB, I have always considered them !!! You have all my respect.
I too have oscilloscopes, found in landfill and then repaired, but at most I attach them to the audio output of something to see the waveform.... I have never been able to use them in a nobler way. E io che mi sento figo se aggiusto una radio a valvole.
Quelli che sanno progettare una ricetrasmittente da zero e neanche AM, ADDIRITTURA SSB, li ho sempre considerati delle divinita' !!! Hai tutta la mia stima.
Anch'io ho degli oscilloscopi, trovati in discarica e poi riparati, ma al massimo li attacco all'uscita audio di qualcosa per vedere la forma d'onda.... non ho mai saputo utilizzarli in maniera piu' nobile. |
| sent on March 01, 2020 (18:33) | This comment has been automatically translated (show/hide original)
@Jacopo - I'll be going to take pictures of my tube amps, designed and built over the years. However, although in recent years I teach (I am a professor of electronics in technical institutes), I have never lost the passion to design and build, obviously for pleasure and not like the years spent working.
Think, my first radio was built 50 years ago, I was 10 years old.... @Jacopo - Prossimamente farò le foto dei miei amplificatori a valvole, progettati e costruiti negli anni. Comunque, anche se negli ultimi anni insegno (sono docente di elettronica negli istituti tecnici), non ho mai perso la passione di progettare e costruire, ovviamente per piacere e non come gli anni passati per lavoro.
Pensa, la mia prima radio fu costruita 50 anni fa, avevo 10 anni.... |
| sent on March 01, 2020 (18:51) | This comment has been automatically translated (show/hide original)
You're great! I await photos of the :-D amps Sei un grande ! Attendo le foto degli ampli  |
| sent on March 01, 2020 (18:53) | This comment has been translated
ok |
| sent on March 01, 2020 (21:35) | This comment has been automatically translated (show/hide original)
I agree with the compliments of Jacopo (great esteem...) and also I am impressed by the part of design that involves knowledge and studies to say the least in depth.
I too (again, sorry Jacopo) i await photos of the amps :-D
A greeting, Marcello Mi accodo ai complimenti di Jacopo (grande stima...) e anche io sono colpito dalla parte di progettazione che implica conoscenze e studi a dir poco approfonditi.
Anche io (ancora, scusa Jacopo) attendo le foto degli ampli
Un saluto, Marcello |
| sent on March 01, 2020 (21:39) | This comment has been automatically translated (show/hide original)
@Monitor - Thank you for your compliments. In-depth studies of course, becoming an engineer has not been easy (beware of those who say otherwise!), although I am still driven by a passion for matter. @Monitor - Grazie dei complimenti. Studi approfonditi certo, diventare ingegnere non è stato facile (diffidate da chi dice il contrario!), anche se il sottoscritto è comunque spinto dalla passione per la materia. |
| sent on March 01, 2020 (23:05) | This comment has been automatically translated (show/hide original)
They're old Rimlocks like EF40 and similar ones I see in pictures ??? Sono delle vecchie rimlock tipo EF40 e similari quelle che vedo in foto ??? |
| sent on March 02, 2020 (6:05) | This comment has been automatically translated (show/hide original)
Yes, it is composed of the rimlock series. Specifically, the valves are: ECH42, EF41, EBC41, EL42. The BFO oscillator is a triodo of the 7-foot EC92 miniature series. The power supply, on the other hand, uses a GRAETZ bridge consisting of 4 silicon diodes with capacitive input and stabilizing resistance (the two large electrolyte capacitors are seen in the photo). I used this series for two reasons: in the 1970s these valves "pulled them behind" and were characterized by a very low consumption in terms of filament power.
I'll also take the photo of the chassis, seen from the bottom, to show the spinning (wiring). Si esatto , è composto dalla serie rimlock. Nello specifico le valvole sono: ECH42, EF41, EBC41, EL42. L'oscillatrice BFO invece è un triodo della serie miniatura 7 piedini EC92. L'alimentazione, invece, utilizza un ponte di GRAETZ costituito da 4 diodi al silicio con ingresso capacitivo e resistenza stabilizzatrice (si vedono nella foto i due grossi condensatori elettrolitici a vitone). Ho utilizzato questa serie per due motivi: negli anni '70 queste valvole te le "tiravano dietro" ed erano caratterizzate da un bassissimo consumo in termini di alimentazione del filamento.
Farò anche la foto del chassis, visto dalla parte inferiore, per far vedere la filatura (cablaggio). |
| sent on March 02, 2020 (10:01) | This comment has been automatically translated (show/hide original)
what a sight! :-D
che spettacolo !
|
| sent on March 02, 2020 (10:10) | This comment has been automatically translated (show/hide original)
I found a rimlock along with octals in a 1951 PA Lesa amp, which a son of mine uses as a headboard for the electric guitar :-D
My forbidden dream is to make a radio with non-heterodine valves, but in direct harmony with several stages accorded with the mobile honeycomb coils, like those fascinating trains of the early twentieth century 8-) .... When I retire at 130, if there's still aMs, I'm going to give you a little thought. Attendo le foto allora !
Ho trovato una rimlock assieme a delle octal in un amplificatore PA Lesa del 1951, che un mio figlio usa come testata per la chitarra elettrica
Il mio sogno proibito e' realizzare una radio a valvole non eterodina, ma a sintonia diretta a piu' stadi accordati con le bobine mobili a nido d'ape, come quegli affascinanti trenini dei primi del novecento  .... quando andro' in pensione a 130 anni, se ci saranno ancora le AM, ci faro' un pensierino. |
| sent on March 02, 2020 (13:20) | This comment has been automatically translated (show/hide original)
Probably, what you found is not a rimlock but an LOCTAL. The latter were larger in size and allowed for greater powers.... The maximum audio yield with rimlocks, EL41 in class A is about 4.5W. In the AB class push-pull stadium (2 valves) you can get to 10 - 12W. Probabilmente, quella che hai trovato non è una rimlock ma una LOCTAL. Queste ultime avano una dimensione più grande e consentivano potenze maggiori.... Il massimo di resa audio con le rimlock, EL41 in classe A è di circa 4.5W. In stadio push-pull classe AB (2 valvole) puoi arrivare a 10 - 12W. |
| sent on March 02, 2020 (14:22) | This comment has been automatically translated (show/hide original)
It is a rimlock EF 40 all glass, used as an entrance. As a driver for the finals there is an octal 6SL7 that commands a push-pull of 6V6. Straightener 5Y3. All FIVRE. The amp has cute that the sheets of the voltage and output transformers are tightened by sturdy cast-iron casting blades instead of the usual ugly C-folded sheet. Once all the capacitors had been replaced and changes made by someone implying a permanent overload to the straightening stage resumed working very well. E' una rimlock EF 40 tutto vetro, usata come ingresso. Come driver per le finali c'e' una octal 6SL7 che comanda un push-pull di 6V6. Raddrizzatrice 5Y3. Tutte FIVRE. L'ampli ha di carino che i lamierini dei trasformatori di tensione ed uscita sono serrati da robusti telai in fusione di ghisa invece della solita bruttissima lamiera piegata a C. Una volta sostituiti tutti i condensatori ed eliminate delle modifiche fatte da qualcuno che implicavano un sovraccarico permanente allo stadio raddrizzatore ha ripreso a funzionare benissimo. |
| sent on March 02, 2020 (14:57) | This comment has been automatically translated (show/hide original)
Ok... It is also worth replacing the 5Y3 straighter with an indirect heating system. In this way you avoid the shock to the filter capacitors, because the tension to their heads rises slowly. Ok... Conviene anche sostituire la raddrizzatrice 5Y3 con una a riscaldamento indiretto. In questo modo eviti lo shock ai condensatori di filtro, perchè la tensione ai loro capi sale lentamente. |
| sent on March 02, 2020 (14:59) | This comment has been automatically translated (show/hide original)
@Jacopo - look at this:
https://www.juzaphoto.com/gallery.php?t?3500422&l?url]
then in the afternoon I'll upload more. @Jacopo - intanto guardati questo:
www.juzaphoto.com/galleria.php?t=3500422&l=it
poi nel pomeriggio caricherò altre. |
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