Search found 6 matches

by Sa2clc
25 Feb 2020, 07:44
Forum: Building MK-VII a.k.a. Paraset
Topic: How I grind FT-171 crystals
Replies: 1
Views: 9417

How I grind FT-171 crystals

Yesterday I ground a crystal, purchased at the paraset shop and I decided to test different approach than I did last time. This time I used 600grit paper made for wet sanding, which I positioned on a thick glass plate (an old TV stand that´s never been used becasue the TV hangs on the wall) I positi...
by Sa2clc
18 Feb 2020, 07:43
Forum: Building MK-VII a.k.a. Paraset
Topic: Dc-dc 45-390v psu?
Replies: 4
Views: 14902

Re: Dc-dc 45-390v psu?

Well, found a local seller who carried the 390 volt modules, tested it to power the paraset, and it does work with no problems at supplying power the transmitter neither. There was hovewer some noise on the receiver, not sure though if that came from the power supply. I already had a vibrator transf...
by Sa2clc
10 Feb 2020, 18:38
Forum: Building MK-VII a.k.a. Paraset
Topic: Another "sorta-done" replica
Replies: 2
Views: 10694

Re: Another "sorta-done" replica

A picture might be of interest :)
[attachment=0]received_761596057701009.jpeg[/attachment]
by Sa2clc
09 Feb 2020, 18:53
Forum: Building MK-VII a.k.a. Paraset
Topic: Dc-dc 45-390v psu?
Replies: 4
Views: 14902

Dc-dc 45-390v psu?

Has anyone tried the DC step up regulators available on ebay for powering the paraset and tube equipment like it?
Claims to be able to deliver 70w (although thats probably asking too much from it).
Audio guys use it with ok results.
Anyone?
by Sa2clc
09 Feb 2020, 13:09
Forum: Building MK-VII a.k.a. Paraset
Topic: Bandspread
Replies: 3
Views: 13208

Re: Bandspread

I put a series 40pf mica cap with the tuning capacitor. Added a 70pf trimmer capacitor i parallell with the series caps, and adjusted that to reach 3500khz on receive.
A better approach would have been a 10pf tuning caps, to better coincide with the 0-100 marks.
by Sa2clc
09 Feb 2020, 11:40
Forum: Building MK-VII a.k.a. Paraset
Topic: Another "sorta-done" replica
Replies: 2
Views: 10694

Another "sorta-done" replica

So, my take on the paraset is almost done. Quite pleased. Although no screenprint yet, I do like the basement nickel plating I put on the front panel. Knobs are resin cast, copied from an original knob, Henk provided coil forms etc. Have had a few qsos so far. Still need to paint the cash box and ma...