|
Vintage Tape (Audio), Cassette, Wire and Magnetic Disc Recorders and Players Open-reel tape recorders, cassette recorders, 8-track players etc. |
|
Thread Tools |
9th Jan 2023, 12:32 pm | #21 |
Nonode
Join Date: Jun 2013
Location: Surbiton, SW London, UK.
Posts: 2,801
|
Re: Akai 4000DS Mk2 track/head select
I have an original manual. Pull for mono (shown as SPST) connects the lower wiper of
SW4 (Tape-Source) to ground. |
9th Jan 2023, 12:34 pm | #22 |
Dekatron
Join Date: Apr 2019
Location: Worthing, West Sussex, UK.
Posts: 6,587
|
Re: Akai 4000DS Mk2 track/head select
So from Restoration73 Post 19, sounds like early 4000DS (Mk. I) did not have the "Pull for mono use switch", which would explain why I am struggling find it on the Mk. I schematic, maybe the schematic was never updated when the switch was added until the Mk. II came out.
Note - I do not think that the first version of the 4000DS was ever officially referred to as Mk. I in any Akai documentation. David |
9th Jan 2023, 12:41 pm | #23 |
Dekatron
Join Date: Apr 2019
Location: Worthing, West Sussex, UK.
Posts: 6,587
|
Re: Akai 4000DS Mk2 track/head select
|
9th Jan 2023, 12:49 pm | #24 | |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
|
Re: Akai 4000DS Mk2 track/head select
Quote:
https://www.lencoheaven.net/forum/in...?topic=21712.0 The components in the photo I've attached are from an Akai 4000DS MKII, from that it can be seen that the pull switch contacts and wiring are as per the schematic and switch board layout shown in the 4000DS MKII's service manual. EDIT: Post crossed. Lawrence. Last edited by ms660; 9th Jan 2023 at 12:57 pm. |
|
9th Jan 2023, 12:50 pm | #25 |
Nonode
Join Date: Jun 2013
Location: Surbiton, SW London, UK.
Posts: 2,801
|
Re: Akai 4000DS Mk2 track/head select
Rank did quite good copies of Akai manuals (not surprising as they were also Xerox)
but the original DS diagram has the switch drawn in by hand. So this mod predated MkII models, but I don't know the date. MkII was available in 1973. |
9th Jan 2023, 2:45 pm | #26 |
Dekatron
Join Date: Apr 2019
Location: Worthing, West Sussex, UK.
Posts: 6,587
|
Re: Akai 4000DS Mk2 track/head select
Yes I have at least three 4000DS (Mk.I) and fairly sure that all have the pull switch (need to double check to be sure) so knew that it came out before the Mk. 2 (which I have 2 of).
David |
9th Jan 2023, 2:47 pm | #27 |
Moderator
Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 22,801
|
Re: Akai 4000DS Mk2 track/head select
It was on the 4000D as well.
David
__________________
Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done |
9th Jan 2023, 2:47 pm | #28 | ||
Dekatron
Join Date: Apr 2019
Location: Worthing, West Sussex, UK.
Posts: 6,587
|
Re: Akai 4000DS Mk2 track/head select
Quote:
David |
||
9th Jan 2023, 2:58 pm | #29 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
|
Re: Akai 4000DS Mk2 track/head select
|
9th Jan 2023, 3:02 pm | #30 |
Nonode
Join Date: Jun 2013
Location: Surbiton, SW London, UK.
Posts: 2,801
|
Re: Akai 4000DS Mk2 track/head select
Funny I have an incomplete 4000DS here (no case, knobs, pinch roller) that has the
pull for mono switch. I am not sure if Akai recorded mods issued by serial number. For example, the X1900D is a combined reel/cassette deck. The manual gives 7.5 and 3.75 ips speed. But mounted in the lid is an extra capstan for 15 ips and a reduced diameter pinch roller. No reference to this option in the manual ! |
9th Jan 2023, 4:15 pm | #31 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
|
Re: Akai 4000DS Mk2 track/head select
Ref. the integral pull switch and the Akai 4000DS, in a copy of a service manual I have there is no pull switch listed in the spares list for that model but there is for the Akai 4000DS MKII as per the attached shots, 1st shot = 4000DS (Ref. 9-64) 2nd shot = 4000DS MKII (Ref. 9-140x)
I think the pull switch was introduced later on during the production of the Akai 4000DS. Lawrence. |
9th Jan 2023, 4:32 pm | #32 | |
Dekatron
Join Date: Apr 2019
Location: Worthing, West Sussex, UK.
Posts: 6,587
|
Re: Akai 4000DS Mk2 track/head select
Quote:
I have an original manual with no sign of the pull switch being hand drawn. David |
|
9th Jan 2023, 5:41 pm | #33 |
Hexode
Join Date: Jun 2018
Location: Buckinghamshire, UK.
Posts: 383
|
Re: Akai 4000DS Mk2 track/head select
Just to add to the mix - The 4000D had two versions of the 'mono' switch. The first (as shown in the sales brochure) was operated by turning the right level control fully anti-clockwise:-
The second the common pull-switch (in a photo from an eBay listing):- Once again the relevant switch in the circuit diagram is unlabelled:- Cheers Last edited by Trigon.; 9th Jan 2023 at 5:51 pm. Reason: Cct added |
9th Jan 2023, 5:43 pm | #34 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
|
Re: Akai 4000DS Mk2 track/head select
I think there's an error in the playback track selector circuit in the 4000DS MKII schematic, does anyone else agree?
Lawrence. Last edited by ms660; 9th Jan 2023 at 5:50 pm. Reason: Part schematic added |
9th Jan 2023, 6:03 pm | #35 |
Nonode
Join Date: Jun 2013
Location: Surbiton, SW London, UK.
Posts: 2,801
|
Re: Akai 4000DS Mk2 track/head select
Is it the right channel p/b head ground not connected to the screen on 3-2?
|
9th Jan 2023, 6:38 pm | #36 |
Moderator
Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 22,801
|
Re: Akai 4000DS Mk2 track/head select
As with any manufacturer, changes may not have gone over directly from one version to another. Sometimes problems are met with the supply of some part and an alternative, sometimes with differences in detailed performance or operation gets substituted and can remain. Mine was an early DS, so I wonder if they intended a slightly more extensive change and then decided soon to revert on cost or supply grounds. Hand-modified diagrams in manuals aren't then so surprising.
David
__________________
Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done |
9th Jan 2023, 6:49 pm | #37 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
|
Re: Akai 4000DS Mk2 track/head select
|
9th Jan 2023, 8:45 pm | #38 | |
Dekatron
Join Date: Apr 2019
Location: Worthing, West Sussex, UK.
Posts: 6,587
|
Re: Akai 4000DS Mk2 track/head select
Quote:
David |
|
9th Jan 2023, 10:17 pm | #39 |
Tetrode
Join Date: Feb 2021
Location: West Sussex, UK
Posts: 54
|
Re: Akai 4000DS Mk2 track/head select
Thanks for all the extra info all.
|