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Search: Posts Made By: Richard
Forum: WD Amplifiers Yesterday, 07:20 PM
Replies: 8
Views: 121
Posted By Richard
Re: WD88VA didn't survive move

Hi Wiggers,
Nothing obviously amiss, so, unless I'm missing something you can see, (and asuming you only have 3 good valves left) I'd fit a good pair to that channel and leave the other side empty,...
Forum: WAD General 6th October 2018, 10:16 AM
Replies: 9
Views: 153
Posted By Richard
Re: KT5881 valve change

Hi Gary,

Some valves are interchangeable and some backwards/forwards compatible but you need to check very carefully.

5881 is a later family member of the 6L6 family. 6L6 was designed as an...
Forum: The Coffee Bar 6th October 2018, 09:21 AM
Replies: 2
Views: 69
Posted By Richard
Re: Hello and help for a new member

Morning Clive and welcome,

As Bob says it's usually easier to give answers about specific items of gear for reason of there being many possible combinations and specs, in particular sensitivities....
Forum: WAD General 5th September 2018, 09:35 AM
Replies: 8
Views: 457
Posted By Richard
Re: WAD K5881 modded to take EL38s

Nice picture from David! No commercial links please folks without running them past Matthew first, thanks.
Forum: WD Amplifiers 29th August 2018, 10:51 AM
Replies: 16
Views: 645
Posted By Richard
Re: KEL84 v KT88

Hi All, yes agreed with everyone so far.


I've owned Kit88 and WD88 and had a couple of Kel84 here for a listen over the years into previous Pro9TL transmission line speakers. Kel84 is a little...
Forum: For Sale 25th July 2018, 07:17 AM
Replies: 25
Views: 1,133
Posted By Richard
Re: FS WAD 300b with mods

Hi Adrian, thread restored, let the Mods know if you'd like to get it back on topic :thumbsup:
Forum: For Sale 24th July 2018, 12:14 PM
Replies: 25
Views: 1,133
Posted By Richard
Re: FS WAD 300b with mods

Hi Adrian and all, I've cleaned up this thread with the soft delete option. It can be read and restored by any Mod who feels it should not have been cleaned up.


This was to keep it to the Rules...
Forum: The Coffee Bar 17th July 2018, 08:31 AM
Replies: 24
Views: 4,097
Posted By Richard
Re: Members Pets Foaties

Very sorry to hear that Col and we're thinking of you, Rich
Forum: WAD Problems 14th July 2018, 08:57 AM
Replies: 7
Views: 352
Posted By Richard
Re: Help needed with Hum please!

Disregard the word "input" and just read ground as the connection to the smoothing cap neg on the drawings btw. (It refers to the original construction, where the chassis was ground and mains earth,...
Forum: WAD Problems 14th July 2018, 08:43 AM
Replies: 7
Views: 352
Posted By Richard
Re: Help needed with Hum please!

Excellent :) A better place to earth the inputs may be 2 individual earth wires to the ground ends of the 100K first valve grid leaks thus separating them from any high currents in the ground...
Forum: WAD Problems 11th July 2018, 05:45 PM
Replies: 7
Views: 352
Posted By Richard
Re: Help needed with Hum please!

Hi Zak, gosh I read your link but couldn't remember posting it, ah well consistent advice anyway :D'oh!:

Yes, worth re-checking, so remove all connections and check K5881 for 10R signal lift, the...
Forum: WAD Problems 11th July 2018, 08:04 AM
Replies: 7
Views: 352
Posted By Richard
Re: Help needed with Hum please!

Hi Zak, you have a ground loop.

K5881 doesn't have an ground lift resistor so its chassis and signal are at mains earth.

Pre PSU signal ground is lifted by 100R but its chassis post is a solid...
Forum: WAD Problems 18th June 2018, 10:41 AM
Replies: 5
Views: 349
Posted By Richard
Re: Update needed for heater bridge rectifier mod

Hi Greg,

RS, all in stock,


1N5820G 774-3341 (G is Pb free) in 10's 25p each
4700uF 25V axial 707-6708 (https://uk.rs-online.com/web/p/aluminium-capacitors/7076708/) in 2's 2.29 each (or...
Forum: WAD Problems 18th June 2018, 10:39 AM
Replies: 5
Views: 349
Posted By Richard
Re: Update needed for heater bridge rectifier mod

Hi Bob, Yes indeed, it may be system or amplifier dependent. It was excellent on my Kit88 driving large transmission lines with noticeable (and measurable) lowering of hum (see Part 1 for the...
Forum: WAD Problems 14th June 2018, 09:52 PM
Replies: 6
Views: 316
Posted By Richard
Re: KaT6550 voltages

Thanks Greg, just sent them :thumbsup:
Forum: WAD Problems 14th June 2018, 08:26 AM
Replies: 6
Views: 316
Posted By Richard
Re: KaT6550 voltages

No probs, pm me your email address.
Forum: WAD Problems 13th June 2018, 09:10 AM
Replies: 6
Views: 316
Posted By Richard
Re: KaT6550 voltages

Hi Greg, they're on p. 6 of the Kit6550 text instructions, let me know if you need the pdf :thumbsup:

TEST VOLTAGES
voltage label position
125Vdc aT LC - V4 pin 1, RC - V3 pin 1
0Vdc g1P LC -...
Forum: WAD General 7th June 2018, 08:57 AM
Replies: 11
Views: 807
Posted By Richard
Re: KEL34 just acquired

Hi yes I'd build it all as standard first to check all is well. It looks like it's wired as single input with vol control so a CDp/tuner will be ideal for a listen. Keep an eye on the EL34s for any...
Forum: WAD General 2nd June 2018, 06:36 PM
Replies: 11
Views: 807
Posted By Richard
Re: KEL34 just acquired

Hi, yes but a fair bit of work involved as you'd need 4 pots in place of the R3/R5 bias divider and to include sockets to probe for voltage during adjustment.

Disconnect the 330k gridleaks at...
Forum: WAD General 2nd June 2018, 01:06 PM
Replies: 11
Views: 807
Posted By Richard
Re: KEL34 just acquired

It seems like an attempt to convert an integrated Kel34 into just power amp as all phono inputs bar 1 are disconnected as is selector switch. Personally I would use 1 phono pair to bypass as Power...
Forum: BB Problems 31st May 2018, 09:55 AM
Replies: 3
Views: 369
Posted By Richard
Re: Missing information in an FAQ thread

Hi again Greg, by copying and pasting into a text editor I found there should be 3 images. I've found the last missing one but as the bb only allows 2 images per post have split this FAQ into 2...
Forum: FAQ - Upgrades and Tweaks 31st May 2018, 09:47 AM
Replies: 0
Views: 371
Posted By Richard
Improving the DC Heater Supply - Part 1; KIT88, KEL34, KEL84

KIT88, KEL34, KEL84

These amps are built on PCBs so the following way of making up "daughter" boards was found easiest. There`s quite a bit to it but if you fancy a go it should be worthwhile. In...
Forum: FAQ - Upgrades and Tweaks 31st May 2018, 09:45 AM
Replies: 0
Views: 210
Posted By Richard
Improving the DC Heater Supply - Part 2; KIT34, KIT6550, 300BPSE, 300BPP

KIT34, KIT6550, 300BPSE, 300BPP

The idea is the same but these amps are built on tag boards so with replacement of the bridge with 4 schottky diodes and a little re-arrangement of the components...
Forum: BB Problems 30th May 2018, 10:18 AM
Replies: 3
Views: 369
Posted By Richard
Re: Missing information in an FAQ thread

Hi Greg, I'm not sure if there was any more text but have attached what I think were the original drawing and photo to show the practical construction :thumbsup:
Forum: WAD General 30th May 2018, 09:07 AM
Replies: 11
Views: 807
Posted By Richard
Re: KEL34 just acquired

Hi Goonybird, sorry for delayed reply, been away. Hope you have the build info you need now if not please pm Matthew or any of the mods.
I had this amp and the follow up Kit88 using a similar mains...
Showing results 1 to 25 of 4613

 
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