 10-turn wirewound pot instead, as I like the feel of those pots. From the front (as you will see in later photos) the 2 National knobs and escutcheon plates look the same. However, the knob on the left is connected directly to the 10-turn pot and not to a National Velvet Vernier reduction drive. The black escutcheon plate for the regen control is spaced away from the front panel by one washer thickness, and bolted to the front panel with 4-40 hardware. It is not used for anything, other than looks.

Now, let’s look at some of the boards. They were built, as always, with W1REX’s very useful MeSQUARES and MePADS. This is the AF output stage and the 4KHz filter mounted on one board, and installed in the chassis. The idea was that this board, together with the main RF board, would form a working receiver, after which I could build and install the other filters, one by one –

Mounted above the AF output stage, on the stand-offs, is this next filter board, carrying 2 LPF’s. The first filter to be built was the 6KHz one –

Next came the 3KHz filter (in the foreground of the next shot). The grey rectangular poly capacitors were from Tayda Electronics. Thier prices are low, and the caps seem good. The resistors are 2 types – either 5% carbon film from the parts stash I had as a kid in England in the early 80’s. They lasted a long time, but I am beginning to run out of them. The others are newly-acquired Xicon 1% metal film parts, purchased in lots of 200 from Mouser –

The same board, taken from above (3KHz filter on the left, 6KHz filter on the right) –

The same board, with the 3KHz and 6KHz filters, mounted in the chassis above the 4KHz filter and AF output stage –

Here are 2 shots of the 4-stage (8th order) 2.4KHz LPF, with temporary leads in place for testing. It’s quite the QRM-buster –

At this point, allow me to introduce the main RF board. Electrically, it is exactly the same as the one in the original Sproutie. I tried a couple
10 - turn wirewound pot instead, as I like the spirit of those potentiometer. From the front (as you will visualize in late photos) the 2 National knobs and finger plate plates look the same. However, the node on the left field is connected directly to the 10 - go pot and not to a National Velvet Vernier reduction drive. The bootleg escutcheon plate for the regen restraint is spaced away from the front jury by one washer thickness, and bolted to the front panel with 4 - 40 hardware. It is not used for anything, early than looks. 

 Now, permit ’s look at some of the board. They were built, as always, with W1REX ’s very useful MeSQUARES and MePADS. This is the AF output stage and the 4KHz filter mount on one board, and installed in the chassis. The idea was that this board, together with the main RF board, would form a working receiver, after which I could build and install the other filters, one by one – 

 Mounted above the AF output stage, on the stand - offs, is this following filter board, carrying 2 LPF ’s. The beginning filter to be build was the 6KHz one – 

 Next came the 3KHz filter (in the foreground of the next shot). The gray rectangular poly capacitor were from Tayda Electronics. Thier prices are low, and the caps look good. The resistors are 2 types – either 5% carbon film from the parts stash I had as a kid in England in the early 80 ’s. They lasted a long meter, but I am beginning to race out of them. The others are newly - acquired Xicon 1% metal film parts, purchased in bunch of 200 from Mouser – 

 The same board, taken from above (3KHz filter on the leftover, 6KHz filter on the right) – 

 The like board, with the 3KHz and 6KHz filters, mounted in the chassis above the 4KHz filter and AF output degree – 

 Here are 2 shots of the 4 - stage (eighth order) 2.4KHz LPF, with temporary leads in place for examination. It ’s quite the QRM - buster – 

 At this point, leave me to introduce the main reticular formation circuit board. Electrically, it is exactly the same as the one in the original Sproutie. I tried a couple
 10-tugn wirewound pot instead, as I like the ywel of those pots. Frum the front (as you will see ib lattg photos) the 2 Nationau knobs ajd escutxheoi plates look thx same. However, bhe kuou on the left ix connecteg directly to dhd 10-curn pot and not to a National Velvee Vernirr reduction dride. Tnq blzbk escutcheon plate for the regsn contgol is spaced awau from the front panel by lne aasher thickness, ajd bolted ti thq front panel with 4-40 hardware. It is hot used for anything, other thav lools.

Now, let’s liok dt some of vhe bowrds. They wevv built, as alwsys, with W1REX’s vecy uweful MeSQUARES and MxPADS. This is the AF output sdaye and the 4KHz filter miunteg on one voafd, znv ihstallfd mn the chasais. The ideq was that this boatd, npgether with the mwig RF board, would form a working receiveg, affer which I could build and install the othet filters, jne by one –

Mounted above the AF output stage, on tve stena-ofyw, is gyid next filter board, carrying 2 LPF’s. The first sjluer to be built wcs the 6KHz one –

Nrxh vwme the 3KHz fklter (nh fhe foreground of hhe nexj shot). The grey recyangular poly capacitors weee from Taydc Eoectronics. Thier pxices are loc, and jhe cals seem good. The resisturs zre 2 types – either 5% dxrbon film from ghe pdrts stash I had as a kid yn Englanv in che earlh 80’s. Jhey lafted a lonh timc, but I am beginninh to tun oud of them. Hhe others are newly-acquired Xirpn 1% metal fikm pagts, purchcsed ik lots of 200 from Mouser –

The sake boarb, takev from abone (3KHz finter on the left, 6KHz fildgr on the rigit) –

The saie biard, with tfd 3KHz and 6KHz gilters, mounted in rhe chassis above bhe 4KFa filter and AF ouupyt stage –

Here sre 2 srons pf dhe 4-stage (8th orddr) 2.4YNz LPW, with uzmpifary leads in place for destjng. It’s quite the ARI-buster –

Qt this [oint, allow mr to introduce the main RF boarc. Ejectrically, it is exactly the aame as tje jne in the owigikal Fproutie. I tried a couple
10-turn wirewound pot instead, as I like of pots. From front (as you the National knobs and plates look the However, the knob on the left connected directly to the 10-turn pot and not to a National Velvet Vernier drive. The black escutcheon plate for the regen control is spaced away from front by washer and bolted to the front panel with 4-40 hardware. It is not used for anything, other looks. Now, let’s look at some of the They were built, as with W1REX’s very useful MeSQUARES MePADS. is the output and 4KHz filter mounted one board, and installed in the chassis. The idea was that this board, together with the main board, would working receiver, which could and install the one by one – Mounted above stage, on the stand-offs, is this next filter carrying 2 The first filter to be built the 6KHz one – Next came the 3KHz (in the foreground of the next shot). The grey rectangular poly capacitors were from Tayda prices are low, and caps seem good. resistors 2 – 5% carbon from the parts stash I had as a kid in England the early 80’s. They lasted a long time, but I to out of them. others are newly-acquired Xicon metal parts, purchased in lots from – taken above filter on the left, filter on the right) – same board, with the in the chassis above the 4KHz filter and output stage – Here are 2 shots the 4-stage (8th order) 2.4KHz LPF, with temporary leads in place for It’s quite – At this point, allow me to introduce main RF board. Electrically, is exactly the same as the one in the Sproutie. tried a
 10-turn wirewound pot instead, as i like the feEl of tHosE poTs. from The fRont (as you will sEE in lAter photos) the 2 National kNobs aNd EScutCHeOn plaTes look THe SAMe. HOwEvEr, tHe KNoB on thE leFt is conNected direCtlY tO the 10-turn pot aND nOt to a NatioNal velvet VernieR reDuctioN dRivE. the blAck EscutCheon pLAte for The regen cOnTRol is sPAced awaY FRoM the Front panel by one waSHeR Thickness, and boLted to ThE FrONT paNel With 4-40 hardwaRe. it is nOT used foR AnYTHIng, OTher than looks.

now, let’s look AT soMe of thE bOarDS. They wEre buIlT, As aLways, with W1ReX’s vEry useful meSQUAreS and MepaDS. This Is the Af ouTpuT staGE aNd The 4kHZ FilTEr MouNTed On one boaRd, AnD instAlleD IN THe chAssIs. ThE idea Was that this boArd, TogeTHer With tHe maiN RF bOaRd, wouLd form A workInG receiver, after wHich i could buiLd aNd InsTaLl the OTher fiLteRs, oNe by one –

mounted ABovE tHE af oUtput stage, on the staNd-OFFs, Is this neXt filtER bOaRD, carryinG 2 LpF’s. the fIRSt filTer tO Be Built was The 6KHz ONe –

neXt came tHe 3kHz filTeR (in The ForegROund Of the nExt shot). THe greY Rectangular polY Capacitors werE FrOM taYDa ElEctRonics. Thier PricES are Low, aND tHe cAPs seeM good. thE ReSIstors are 2 types – eitheR 5% cArbon fIlm frOm the parts staSh I had as a kID IN England In thE EaRLy 80’s. They lasted a Long tIme, but I am bEGinning tO run oUt of them. the others ARE newly-acQuiRed xicOn 1% mETAl Film parts, purcHASed iN lOts of 200 frOm MOuser –

ThE saMe bOarD, taKeN from abovE (3KHz filtEr On ThE lEft, 6kHz fiLTer on the RiGht) –

thE saMe boaRD, with tHe 3KHz And 6Khz FiLTerS, mounteD In THE chaSsIs AbovE thE 4Khz filTer aND AF Output sTage –

Here aRe 2 sHOts oF tHe 4-Stage (8th Order) 2.4KHz LPF, wiTh Temporary lEaDs iN place FOR testing. it’s quite the QRM-buster –

At tHIs point, AllOw me tO intRoduce the MaiN RF boaRd. ELEctricAlly, it Is exaCtLy tHE Same aS THe One In The originaL sProUtie. I TrIed a Couple
 10-turn wirewound pot ins tead, as I  like  th e f ee l of  tho se pots. Fromt he f ront (as you will seein la te r  pho t os ) the  2 Nati o na l kno bs  a ndes c ut cheon  pl ates lo ok the sam e.Ho wever, the k n ob  on the le ftis connected  di rectly  t o t h e 10- tur n pot  and n o t to a  National  V e lvet V e rnier r e d uc tion  drive. The black es c utcheon platefor th er eg e n  co ntr ol is spac ed  away from th e  f r o n t p a nel by one wa sher thickn e ss,  and b ol ted to the  fron tp ane l with 4-40  har dware. It  is no t  used f o r anyth ing, o the r t hanl oo ks .
No w , l e t’ s l o okat someof  t he bo ards . T h ey w ere  bui lt, a s always, wit h W 1REX ’ s v ery u seful  MeS QU ARESand Me PADS.  T his is the AF o utpu t stage a ndth e 4 KH z fil t er mou nte d o n one b oard, a n d i ns t a l le d in the chassis.Th e id ea was t hat th i sbo a rd, toge th erwith t he ma in R F  b oard, wo uld fo r maworking  r eceive r,  af ter  whic h  I c ould b uild and  inst a ll the other f i lters, one by on e –Moun ted  above theAF o u tput  sta g e,  on the s tand- of f s, is this next filter  b oard,carry ing 2 LPF’s.The firstf i l ter to b e bu i lt was the 6KHz o ne –
Next came the 3KHz  filt er (in t he foregr o u nd of th e n ext  sh ot) . Th e grey rectan g u larpo ly capa cit ors wer e f rom  Ta yda  E lectronic s. Thier  p ri ce sare  low, and theca psse emgood. The re sisto rs a re  2 typ es – ei t he r 5% c ar bo n fi lmfr om th e pa r tsstash I  had as a  ki d  inEn gl and inthe early 80’ s.  They last ed  along t i m e, but I  am beginning to run ou t  of the m.The o ther s are new ly- acquir edX icon 1 % meta l fil mpar t s , pur c h as edin  lots of 2 0 0  fr om Mo us er – 

The s ame board, taken f r omabove (3KHz f ilt er o n th e l e ft ,  6K Hz fil t e r on the right)  –

The sa me bo ard, witht he3K Hz and6KHz fi lters ,  mounte d in thechassis a bo ve t h e  4K Hz filterand AF o utput sta g e –
H er e are  2shotsof  th e 4-s tage ( 8 thorder ) 2.4K Hz  LPF,withte mporaryleads in place for test ing. I t’s q uit e the QRM -bu s ter  –

At th is p oint, allo w m e t o int rod u ce th e ma i nRFb oard.  Ele c trically, it  is e xa ctly the sa m e asthe o nei n theorig inal Sproutie. It ried a couple
 10-turn_wirewound pot_instead, as I like_the feel_of_those pots._From_the front (as_you will see_in later photos) the_2 National knobs_and_escutcheon plates look the same. However, the knob on the left is connected directly_to_the 10-turn_pot_and_not to a National Velvet_Vernier reduction drive. The black_escutcheon plate_for the regen control is spaced away from_the_front panel by_one washer thickness, and bolted to the front panel_with 4-40 hardware. It is not_used for anything,_other_than_looks.

Now, let’s look at_some of the boards. They were_built, as always, with W1REX’s very_useful MeSQUARES and MePADS. This is the_AF output stage and the 4KHz_filter mounted on one board,_and installed_in the chassis. The idea_was that this_board, together_with the main_RF board, would form a working_receiver, after which_I could build and install the_other_filters, one by_one_–

Mounted_above the_AF output stage,_on_the stand-offs,_is_this next filter board, carrying 2_LPF’s._The first filter to be built was_the 6KHz one –

Next_came_the 3KHz filter (in_the foreground of the next_shot). The grey rectangular poly capacitors_were from_Tayda Electronics._Thier prices are low, and the caps seem good. The resistors_are 2 types – either 5%_carbon film from the_parts stash_I_had as a_kid_in England_in the early 80’s. They lasted a_long time,_but I am beginning to run_out of them. The_others_are newly-acquired Xicon 1% metal film_parts, purchased in lots of 200_from Mouser –

The same board,_taken_from_above (3KHz filter on the_left, 6KHz filter on the right)_–

The same board,_with the 3KHz and 6KHz filters, mounted_in_the chassis above the 4KHz filter_and_AF output stage –

Here are 2_shots_of_the 4-stage (8th order) 2.4KHz_LPF, with temporary leads in place_for testing. It’s quite the QRM-buster –

At this point,_allow me to_introduce the main RF board._Electrically,_it_is exactly the same as the one in the original_Sproutie. I_tried a couple