en modern 5F1 with Boothill kit and Mergili cabinet

Updated on September 25, 2019 | 3161 Views all
29 on April 14, 2019

found this nicely built 5F1 with 10″ WGS speaker in Mergili cabinet on Ebay while I was in search of the parts for my first 5F1 build. grabbed it off for very good price and I’m changing the components and wires one by one like the filter caps, bypass caps, speaker wires along with the plug.

I think the speaker wires and Amperex 12ax7 changed way more than the capacitors. I’m waiting for yellow and red Jupiter 0.022 caps as well. an A/B comparison video on youtube was very interesting. and red one looks very close to the original Astron firecracker.

there are few tweed amp inspired cabinets around. and it’s the first cab I like except for the original ones. this cabinet sings with WGS ceramic speaker. I’ve been biased toward vintage Jensen alnico speakers so far. and this speaker changed it a bit

 

the orange filter caps are Roederstein 33uf 450v which replaced the stock caps from the kit. I didn’t know the limit of 5y3 and was brave enough to put two of them on it. then realized the rectifier was too hot and went to 33+10+10.

the first 33uf right next to the rectifier seems fine so far. I’ve tried on the original 5D3 and 5F1 without an issue before. this very capacitor is one of the caps I trust most

 

 

this 5F1 is dead quiet and the filament wiring is a bit different to the original champ. I’m trying to figuring out it. nothing is easy with the electric stuff even 5F1 is this simple.

I’ve got some NOS Sprague black beauty caps 15 years ago and tried it on this amp. I expected something vintage with them. but I’ve learned they are not useful as the coupling caps. they were good as the guitar tone caps. but they dramatically reduced the output volume regardless of the values. realized why my 18watt replica’s output volume was that low 15 years ago today. I’m still wondering why anyway. 

[update] the sprague caps I put on this amp had twice high capacitance than the marking. I couldn’t find any 0.02 and tried 0.03 but they actually were over 0.05. higher capacitance changes the frequency and reduces the output volume as I learned from them. and NOS caps need time to break in. they sound getting louder for the last few days

 

 

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4 on April 15, 2019

Wow. The amp looks in really good shape. Or did you clean it by yourself?

on April 15, 2019

it’s only a few years old cabinet with shellac finish. looks old but it’s a trick

on April 16, 2019

Beautiful piece of craftsmanship, design & engineering.

on April 17, 2019

I remember you talked about Shellac a couple of months ago. I knew you’d interested in this cabinet. and this one meets your standard I guess.

I’ve seen a few different tweed replica cabinets before and this piece is the best so far. this cab sings like the old tweed amps and will be getting better over time. 

on April 17, 2019

Shellac coating gives every wood surface a “special” touch. I once learned its application during my apprenticeship training back then. But haven’t applied since then, also it is time consuming and expensive.

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0 on April 16, 2019

the Heyboer HTS-12005 power transformer is different to the usual 5F1 PT. B+ is 420V with RCA and GE 5y3, and 422V with Bendix. it’s too hot while B+ is about 340V on 5F1. the B+ on my ’59 champ is 320V and I remember I’ve read a thread about vintage champ with 360V B+ on somewhere before.

Boothill amp says it’s OK and I remember I built a couple of 18watt replicas which were very hot biased with Heyboer transformers a while ago. 

I’m wondering if it’s fine with 5v4g. B+ is 437V with 5v4g on this 5F1. I’ll check the plate voltage soon. but I need to know which one is plate first. and what plate voltage means as well. I only know they need to be read.

it’s my final, I hope, setup with 22+22+10 filter caps which have almost zero 60hz hum. the black beauty caps are 0.01uf marked on it. and they actually are around 0.02uf. I’m wondering how the sound goes while and after breaking in if it’s true on the coupling caps.

https://www.sozocapacitors.com/break/

 

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0 on April 19, 2019

got this spec. sheet of HTS-12005 from Heyboer. the secondary output is 370v-0-370v

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2 on April 22, 2019

Item: Yamaha EZ-TP MIDI digital trumpet. I guess this instument is still missing in your collection? 😂

on April 22, 2019

it’s ugly as much as Casio midi guitar with black nylon strings from 80’s. :p

on April 24, 2019

Haha! Yes the 80s was a strange decade in design questions.

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3 on April 23, 2019

Jupiter caps are a bit smaller than the original Astron yellow and firecracker caps. bought them from this shop. 

https://www.partsconnexion.com/JUPITER-74275.html

 

on April 25, 2019
A comparison between two famous analogue era capacitors. Jupiter Red Astrons Vs Jupiter Yellow Mustards. These are new replicas made to vintage specification…

 

on April 26, 2019

yellow mustard sounds like ge 12ax7 and the red ones are like rca 12ax7 to me. i didn’t believe the caps make the sound different until now

on April 26, 2019

I still think over choosing one of them. but I know I’m going to the red ones for the look. 

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3 on April 29, 2019

Jupiter firecracker caps are crispy just like the sound from the youtube video. btw, I came back to 32+10+10 filter caps. I like this tight bass with this big cabinet. 

 

on April 29, 2019

a friend has a blankenship 5e3 with 50’s jensen p12r. it sounds way different with too much bass to my original 5e3. I guess the 1st filter cap does it

on April 29, 2019

i like more sag with the stock caps

on April 30, 2019

I feel pretty much same with my 5D3. I tried the same 33uf Roederstein cap on it and came back to 20uf. the original vintage cabinets sing and the stock or similar capacitance sounds good to me. it has 20uf 500v with two of 16uf 475v.

this 33uf trick still works great with this new 10″ 5F1 

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0 on May 8, 2019

this Jensen 10J11  smooth cone speaker is not loud as much as the stock 5F1 speaker nor WGS veteran 10″.  

 

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0 on May 8, 2019

the circuit looks better with the pushback wires

 

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0 on May 10, 2019

I’m still sticking with this 10J11 speaker but the volume is too small for this amp. maybe this speaker isn’t good for any guitar amp. I found this article and figured out the difference between the wattage and SPL

Specialists in professional, commercial, office, studio and broadcast sound equipment.

 

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0 on May 12, 2019

I’ve learned how to wire the 6.3v supply today. 60hz hum was very low and hardly noticeable from the beginning and it’s completely gone

thanks @dragonash

https://www.diyaudio.com/forums/tubes-valves/211731-heater-wiring-bad-ugly.html

http://www.valvewizard.co.uk/heater.html

 

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0 on May 15, 2019

came to the original fuse holder and the correct pilot lamp today. 

 

 

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0 on May 17, 2019

found the right power tube for this 5F1. Ken-Rad makes this amp loud again

while my 5F1 project is not loud enough with Jensen 10J11 speaker, I tried a few different 6v6 tubes for the last few days. and I noticed Ken-Rad 6v6GT/G tubes are louder than the other 6v6GT tubes. and I like the texture from this tube. I cannot listen the difference between RCA, GE, and Sylvania …
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0 on May 27, 2019

came to eyelet board while replacing the wires in the back side. also put 60’s switchcraft jacks on the speaker output and input #1

the filter caps are still same. I just put my spare paper sleeve from Cornell Dubilier on Vishay-Philips 10uf 450v caps

 

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0 on June 16, 2019

got a new speaker for this amp

didn’t know Jensen had Concert series speakers with ceramic magnets before. this PM-1002 sounds pretty much like alnico speaker with thiner cone paper. I believed it was alnico speaker when I grabbed this off ebay for $69 plus shipping. then googled what Syntox-6 was after a week playing this in my 5F1 project. a bit …

 

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0 on June 25, 2019

found some more Roederstein caps for the next 50 years. they are robust and sounds second to none to me.

 

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0 on July 16, 2019

came back to Alnico 10J11 while my recent score, P10R smooth cone needs to see a doctor

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0 on September 25, 2019

my P10R has come back after sitting in the truck for the last couple of months. it’s way better than 10J11 which has smaller voice coil. I’m going to stick with this smooth cone P10R

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